Manufacturing method for dispersion body and manufacturing method for ceramic sintered body

ABSTRACT

In a manufacturing method for manufacturing a dispersion body, a plurality of types of solid particles, water, and a liquid other than water are mixed. The solid particles and the liquid are selected such that Hansen spheres of at least two types of the solid particles and a Hansen sphere of at least one type of the liquid mutually overlap, and a Hansen solubility parameter distance to water of at least one type of the solid particles of which the Hansen spheres overlap that of the liquid is greatest among all solid particles used in manufacturing of the dispersion body, and used to manufacture the dispersion body.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application is a continuation application of InternationalApplication No. PCT/JP2021/007395, filed on Feb. 26, 2021, which claimspriority to Japanese Patent Application No. 2020-034361, filed on Feb.28, 2020. The contents of these applications are incorporated herein byreference in their entirety.

BACKGROUND Technical Field

The present disclosure relates to a manufacturing method for adispersion body in which solid particles are dispersed in water and amanufacturing method for a ceramic sintered body.

Related Art

In a manufacturing process for a product that includes a ceramicsintered body, solid particles that serve as a ceramic raw material aredispersed in a liquid, so that a dispersion body, such as a slurry, apaste, or a green body, is manufactured. This dispersion body is moldedand fired, so that the ceramic sintered body is manufactured.

SUMMARY

One aspect of the present disclosure provides a manufacturing method formanufacturing a dispersion body by mixing a plurality of types of solidparticles, water, and a liquid other than water. In the manufacturingmethod, the solid particles and the liquid are selected such that Hansenspheres of at least two types of the solid particles and a Hansen sphereof at least one type of the liquid mutually overlap, and a Hansensolubility parameter distance to water of at least one type of the solidparticles of which the Hansen spheres overlap that of the liquid isgreatest among all solid particles used in manufacturing of thedispersion body, and used to manufacture the dispersion body.

BRIEF DESCRIPTION OF THE DRAWINGS

In the accompanying drawings:

FIG. 1 is an explanatory diagram of a Hansen sphere for solid particles;

FIG. 2 is a schematic diagram of a configuration of an apparatus formeasuring a contact angle by a permeation speed method;

FIG. 3 is a perspective view of a honeycomb structure;

FIG. 4(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 1 isshown on a plane defined by a London dispersion force δ_(d) anddipole-dipole force δ_(p), FIG. 4(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 1 is shown on a plane defined by a dipole-dipoleforce δ_(p) and hydrogen bonding force δ_(h), and FIG. 4(c) is anexplanatory diagram in which the overlap of the Hansen spheres of thesolid particles and the liquid in comparative example 1 is shown on aplane defined by the London dispersion force δ_(d) and hydrogen bondingforce δ_(h);

FIG. 5(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 2 isshown on a plane defined by the London dispersion force δ_(d) anddipole-dipole force δ_(p), FIG. 5(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 2 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.5(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 2is shown on a plane defined by the London dispersion force δ_(d) andhydrogen bonding force δ_(h);

FIG. 6(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 3 isshown on a plane defined by the London dispersion force ad anddipole-dipole force δ_(p), FIG. 6(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 3 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.6(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 3is shown on a plane defined by the London dispersion force ad andhydrogen bonding force δ_(h);

FIG. 7(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 4 isshown on a plane defined by the London dispersion force ad anddipole-dipole force δ_(p), FIG. 7(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 4 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.7(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 4is shown on a plane defined by the London dispersion force ad andhydrogen bonding force δ_(h);

FIG. 8(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 1 is shown on a planedefined by the London dispersion force ad and dipole-dipole force δ_(p),FIG. 8(b) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in example 1 is shown on aplane defined by the dipole-dipole force δ_(p) and hydrogen bondingforce δ_(h), and FIG. 8(c) is an explanatory diagram in which theoverlap of the Hansen spheres of the solid particles and the liquid inexample 1 is shown on a plane defined by the London dispersion force adand hydrogen bonding force δ_(h);

FIG. 9(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 2 is shown on a planedefined by the London dispersion force ad and dipole-dipole force δ_(p),FIG. 9(b) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in example 2 is shown on aplane defined by the dipole-dipole force δ_(p) and hydrogen bondingforce δ_(h), and FIG. 9(c) is an explanatory diagram in which theoverlap of the Hansen spheres of the solid particles and the liquid inexample 2 is shown on a plane defined by the London dispersion forceδ_(d) and hydrogen bonding force δ_(h);

FIG. 10(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 3 is shown on a planedefined by the London dispersion force δ_(d) and dipole-dipole forceδ_(p), FIG. 10(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 3 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 10(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 3 is shown on a plane defined by the London dispersion forceδ_(d) and hydrogen bonding force δ_(h);

FIG. 11(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 4 is shown on a planedefined by the London dispersion force δ_(d) and dipole-dipole forceδ_(p), FIG. 11(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 4 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 11(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 4 is shown on a plane defined by the London dispersion forceδ_(d) and hydrogen bonding force δ_(h);

FIG. 12(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 5 is shown on a planedefined by the London dispersion force δ_(d) and dipole-dipole forceδ_(p), FIG. 12(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 5 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h) plane, and FIG. 12(c) is an explanatory diagram inwhich the overlap of the Hansen spheres of the solid particles and theliquid in example 5 is shown on a plane defined by the London dispersionforce δ_(d) and hydrogen bonding force δ_(h);

FIG. 13(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 6 is shown on a planedefined by the London dispersion force δ_(d) and dipole-dipole forceδ_(p), FIG. 13(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 6 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 13(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 6 is shown on a plane defined by the London dispersion forcead and hydrogen bonding force δ_(h);

FIG. 14(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 7 is shown on a planedefined by the London dispersion force ad and dipole-dipole force δ_(p),FIG. 14(b) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in example 7 is shown on aplane defined by the dipole-dipole force δ_(p) and hydrogen bondingforce δ_(h), and FIG. 14(c) is an explanatory diagram in which theoverlap of the Hansen spheres of the solid particles and the liquid inexample 7 is shown on a plane defined by the London dispersion force adand hydrogen bonding force δ_(h);

FIG. 15(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 8 is shown on a planedefined by the London dispersion force ad and dipole-dipole force δ_(p),FIG. 15(b) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in example 8 is shown on aplane defined by the dipole-dipole force δ_(p) and hydrogen bondingforce δ_(h), and FIG. 15(c) is an explanatory diagram in which theoverlap of the Hansen spheres of the solid particles and the liquid inexample 8 is shown on a plane defined by the London dispersion force adand hydrogen bonding force δ_(h);

FIG. 16(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 9 is shown on a planedefined by the London dispersion force ad and dipole-dipole force δ_(p),FIG. 16(b) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in example 9 is shown on aplane defined by the dipole-dipole force δ_(p) and hydrogen bondingforce δ_(h), and FIG. 16(c) is an explanatory diagram in which theoverlap of the Hansen spheres of the solid particles and the liquid inexample 9 is shown on a plane defined by the London dispersion forceδ_(d) and hydrogen bonding force δ_(h);

FIG. 17(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 10 is shown on aplane defined by the London dispersion force ad and dipole-dipole forceδ_(p), FIG. 17(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 10 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 17(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 10 is shown on a plane defined by the London dispersion forcead and hydrogen bonding force δ_(h);

FIG. 18(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 11 is shown on aplane defined by the London dispersion force ad and dipole-dipole forceδ_(p), FIG. 18(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 11 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 18(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 11 is shown on a plane defined by the London dispersion forcead and hydrogen bonding force δ_(h);

FIG. 19(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 5 isshown on a plane defined by the London dispersion force ad anddipole-dipole force δ_(p), FIG. 19(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 5 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.19(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 5is shown on a plane defined by the London dispersion force ad andhydrogen bonding force δ_(h);

FIG. 20(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 6 isshown on a plane defined by the London dispersion force δ_(d) anddipole-dipole force δ_(p), FIG. 20(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 6 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.20(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 6is shown on a plane defined by the London dispersion force ad andhydrogen bonding force δ_(h);

FIG. 21(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 7 isshown on a plane defined by the London dispersion force ad anddipole-dipole force δ_(p), FIG. 21(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 7 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.21(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 7is shown on a plane defined by the London dispersion force ad andhydrogen bonding force δ_(h);

FIG. 22(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in comparative example 8 isshown on a plane defined by the London dispersion force ad anddipole-dipole force δ_(p), FIG. 22(b) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin comparative example 8 is shown on a plane defined by thedipole-dipole force δ_(p) and hydrogen bonding force δ_(h), and FIG.22(c) is an explanatory diagram in which the overlap of the Hansenspheres of the solid particles and the liquid in comparative example 8is shown on a plane defined by the London dispersion force ad andhydrogen bonding force δ_(h);

FIG. 23(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 12 is shown on aplane defined by the London dispersion force ad and dipole-dipole forceδ_(p), FIG. 23(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 12 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 23(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 12 is shown on a plane defined by the London dispersion forceδ_(d) and hydrogen bonding force δ_(h);

FIG. 24(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 13 is shown on aplane defined by the London dispersion force ad and dipole-dipole forceδ_(p), FIG. 24(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 13 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 24(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 13 is shown on a plane defined by the London dispersion forcead and hydrogen bonding force δ_(h);

FIG. 25(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 14 is shown on aplane defined by the London dispersion force ad and dipole-dipole forceδ_(p), FIG. 25(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 14 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 25(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 14 is shown on a plane defined by the London dispersion forcead and hydrogen bonding force δ_(h); and

FIG. 26(a) is an explanatory diagram in which overlap of the Hansenspheres of solid particles and a liquid in example 15 is shown on aplane defined by the London dispersion force ad and dipole-dipole forceδ_(p), FIG. 26(b) is an explanatory diagram in which the overlap of theHansen spheres of the solid particles and the liquid in example 15 isshown on a plane defined by the dipole-dipole force δ_(p) and hydrogenbonding force δ_(h), and FIG. 26(c) is an explanatory diagram in whichthe overlap of the Hansen spheres of the solid particles and the liquidin example 15 is shown on a plane defined by the London dispersion forcead and hydrogen bonding force δ_(h).

DESCRIPTION OF THE EMBODIMENTS

In a manufacturing process for a product that includes a ceramicsintered body, a dispersion body, such as a slurry, a paste, or a greenbody, is manufactured by solid particles that serve as a ceramic rawmaterial being dispersed in a liquid. The ceramic sintered body ismanufactured by this dispersion body being molded and fired. From aperspective of preventing breakage due to temperature difference duringfiring in the ceramic sintered body that has a large mass or volume andthe like, as the liquid, use of an organic solvent is avoided and wateris used.

When water is used, an issue regarding dispersibility arises.Dispersibility is unstable in a dispersion body that is composed ofsolid particles, a liquid dispersant, water, and the like that have beenselected based on past ideas and theories. That is, tendencies indispersibility differ depending on combinations of raw materials. Inaddition, even when types of raw materials are fixed, the tendencies indispersibility may change if a manufacturer, a lot, or the like changes.When the dispersibility changes, even if firing is performed under samefiring conditions, for example, defects such as cracks may occur in theceramic sintered body. The dispersibility may be temporarily improvedand a high-dispersion state may be achieved by a mixing time duringmanufacturing of the dispersion body being increased. However, thehigh-dispersion state tends to be lost over time. As disclosed inJapanese Patent Publication No. 4782282, for improvement indispersibility, use of a Hansen solubility parameter (that is, HSP)theory is proposed.

In general, research into the HSP theory relates to optimal selection ofa solvent other than water or an optimal selection of a combination of aplurality of solvents for a single raw material. Under a premise that aplurality of solid raw materials and water are used, combinations ofsolid particles and liquids are limitless depending on objectives andpurposes. That is, indicators for improving dispersibility are nottechnically established for cases in which water and a plurality ofsolid particles are mixed. Therefore, in actuality, the combination isdetermined through reliance on intuition or know-how of a worker orthrough trial and error in experiments.

The present disclosure provides a manufacturing method for a dispersionbody that has favorable dispersibility and a manufacturing method for aceramic sintered body using the dispersion body.

A first exemplary embodiment of the present disclosure provides amanufacturing method for a dispersion body that is a method formanufacturing a dispersion body by mixing a plurality of types of solidparticles, water, and a liquid other than water, in which the solidparticles and the liquid are selected such that Hansen spheres of atleast two types of the solid particles and a Hansen sphere of at leastone type of the liquid mutually overlap, and a Hansen solubilityparameter distance to water of at least one type of the solid particlesof which the Hansen spheres overlap that of the liquid is greatest amongall solid particles used in manufacturing of the dispersion body, andused in the manufacturing of the dispersion body.

A second exemplary embodiment of the present disclosure provides amanufacturing method for a dispersion body that is a method formanufacturing a dispersion body by mixing a plurality of types of solidparticles, water, and a liquid other than water, in which at least twotypes of solid particles are selected from a solid particle candidategroup of which a Hansen solubility parameter distance to water is equalto or greater than 28 MPa^(1/2), and the solid particles and the liquidare selected such that Hansen spheres of the solid particles and aHansen sphere of at least one type of the liquid from a liquid candidategroup mutually overlap, and used in manufacturing of the dispersionbody.

A third exemplary embodiment of the present disclosure provides amanufacturing method for a ceramic sintered body in which the solidparticles are a ceramic raw material, the manufacturing method includingmolding and firing a dispersion body that is obtained by theabove-described manufacturing method.

In the above-described manufacturing methods for a dispersion bodyaccording to the first and second exemplary embodiments, a combinationthat is suitable for high dispersion is selected as the solid particlesand the liquid. Therefore, as a result of the above-describedmanufacturing methods, a dispersion body that has favorabledispersibility while containing water can be manufactured. Consequently,for example, variations in density in the dispersion body can bereduced.

In the above-described manufacturing method for a ceramic sintered bodyaccording to the third exemplary embodiment, because the dispersion bodyis molded, variations in density in a molded body can be reduced.Consequently, occurrence of defects, such as breakage, in the ceramicsintered body can be prevented.

As described above, according to the above-described aspects, amanufacturing method for a dispersion body that has favorabledispersibility and a manufacturing method for a ceramic sintered bodyusing the dispersion body can be provided.

Here, reference numbers within the parentheses in the scope of claimsindicate corresponding relationships with specific means according toembodiments described hereafter, and do not limit the technical scope ofthe present disclosure.

The above-described exemplary embodiments of the present disclosure willbe further clarified through the detailed description herebelow, withreference to the accompanying drawings.

First Embodiment

An embodiment related to a manufacturing method for a dispersion bodywill be described. The dispersion body is manufactured by solidparticles, water, and a liquid being mixed. The liquid is a liquid otherthan water. In the manufacturing of the dispersion body, two or moretypes of solid particles and one or more types of liquids are used.Specifically, the solid particles are powder and, for example, arecomposed of inorganic material. For example, the liquid is composed ofliquid organic matter and is that which is referred to as a dispersant,a lubricant, a binder, or the like. Such a liquid is referred to,hereafter, as a “non-aqueous liquid,” as appropriate.

As the solid particles and the non-aqueous liquid that are used in themanufacturing of the dispersion body, those of which Hansen spheres ofthe at least two types of solid particles and a Hansen sphere of the atleast one type of non-aqueous liquid mutually overlap are selected. Forexample, when the Hansen spheres of the two types of solid particlesmutually overlap and at least one of these Hansen spheres overlap theHansen sphere of the non-aqueous liquid, this means that the Hansenspheres mutually overlap. In addition, when the Hansen sphere of one ofthe two types of solid particles and the Hansen sphere of thenon-aqueous liquid mutually overlap, and either of these Hansen spheresoverlap the Hansen sphere of the other of the two types of solidparticles, this also means that the Hansen spheres mutually overlap.Furthermore, when the three Hansen spheres of the two types of solidparticles and the non-aqueous liquid mutually overlap, this also meansthat the Hansen spheres mutually overlap. That is, when two or moresections of overlap in the three Hansen spheres are present, this meansthat the Hansen spheres of the at least two types of solid particles andthe Hansen sphere of the at least one type of non-aqueous liquidmutually overlap. Here, if the Hansen spheres at least are inpoint-contact, this means that the Hansen spheres overlap each other.When the Hansen spheres share a portion of volume of each other or oneHansen sphere is inside another Hansen sphere as well, this also meansthat the Hansen spheres overlap each other.

In addition, at least the solid particles that is one type among thesolid particles of which the Hansen spheres overlap that of thenon-aqueous liquid, of which a Hansen solubility parameter distance Rais greatest among all solid particles used in the manufacturing of thedispersion body are selected and used in the manufacturing of thedispersion body. The Hansen solubility parameter distance Ra is adistance between a Hansen solubility parameter of water and a Hansensolubility parameter of the solid particles. In subsequent descriptions,the Hansen solubility parameter is denoted as “HSP,” as appropriate.

Therefore, in the manufacturing of the dispersion body, the solidparticles and the non-aqueous liquid that meet condition A and conditionB, below, can be used in combination.

Condition A: From a solid particle candidate group and a non-aqueousliquid candidate group, a combination of solid particles and non-aqueousliquid in which the Hansen spheres of at least two types of solidparticles and the Hansen sphere of at least one type of non-aqueousliquid mutually overlap is determined.

Condition B: One of the solid particles that meet condition A has theHSP distance Ra to water that is the greatest among all solid particlesused in the manufacturing of the dispersion body.

The solid particle candidate group and the non-aqueous liquid candidategroup are determined based on the dispersion body to be fabricated. Forexample, when the dispersion body is used in a ceramic sintered body,the solid particle candidate group can be determined such that, forexample, raw materials of the solid particles chemically react to eachother after firing and a ceramic sintered body that has a desiredmaterial property is obtained. The solid particle candidate group caninclude solid particles that are of differing manufacturers, lots,extraction locations, and the like. For example, the non-aqueous liquidcandidate group can include liquid solvents, dispersants, lubricants,binders, and the like that are used for dispersion of the solidparticles.

The material property of the solid particles is not particularly limitedand, for example, is determined based on intended use of the dispersionbody. For example, the solid particles include a ceramic raw material.For example, when the dispersion body is used in manufacturing of ahoneycomb structure for an exhaust gas purification filter or a sealingportion for sealing an end surface of the honeycomb structure, as thesolid particles, silica, aluminum hydroxide, talc, kaolin, alumina, apore-forming material, and the like can be used. When the dispersionbody is used in manufacturing of a honeycomb structure for a monolithcarrier that is used to carry an exhaust gas purification catalyst, asthe solid particles, kaolin, aluminum hydroxide, silica, alumina, talc,a pore-forming material, and the like can be used. When the dispersionbody is used in manufacturing of a honeycomb structure that has acatalytic function (specifically, a promoter function of a noble metalcatalyst), as the solid particles, ceria, zirconia, a ceria-zirconiasolid solution, alumina, and the like can be used. In addition to theforegoing, the dispersion body is used in manufacturing of separatorsand electrodes of solid-state batteries, solid electrolyte bodies ofsensors, insulators, and the like. In this case, as the solid particles,a solid electrolyte, alumina, and the like can be used. As thenon-aqueous liquid, an active solvent such as an amphoteric solvent, anacidic solvent, or a basic solvent, an inert solvent, and the like areused.

Properties and viscosity of the dispersion body are not particularlylimited. The dispersion body is a concept that is referred to as aslurry, a paste, a green body, and the like and includes a mixture ofwater, a non-aqueous liquid other than water, and solid particles. Forexample, in the dispersion body, the solid particles and the non-aqueousliquid other than water are dispersoids, and water is a dispersionmedium.

In the manufacturing of the dispersion body, the Hansen spheres of thesolid particles and the non-aqueous liquid, and the Hansen solubilityparameter distance Ra between water and the solid particles aredetermined. Hereafter, the Hansen spheres and the HSP distance Ra willbe described.

First, the HSP theory will be described. In general, in this theory,surface energies of solutes, solvents, and gases are quantified andclassified based on three items. Three energies are London dispersionforce δ_(d), dipole-dipole force δ_(p), and hydrogen bonding forceδ_(h). The unit of each energy is MPa^(1/2). That is, an HSP value isexpressed as coordinates within a three-dimensional space that isreferred to as a Hansen space in which the London dispersion forceδ_(d), the dipole-dipole force δ_(p), and the hydrogen bonding forceδ_(h) are each a coordinate axis.

For example, a case in which solubility of a solute A and a solvent B isstudied will be examined based on the HSP theory. When the HSP value ofthe solute A is (δ_(dA), δ_(pA), δ_(hA)) and the HSP value of thesolvent B is (δ_(aB), δ_(pB), δ_(hB)), the distance between these HSPvalues (that is, an HSP distance Ra₁) is expressed by expression I,below.

Ra₁={4·(δ_(dA)−δ_(aB))²+(δ_(pA)−δ_(pB))²+(δ_(hA)−δ_(hB))²}^(1/2)  ExpressionI

The solute is more easily dissolved in the solvent as the HSP distanceRa₁ decreases. In a case of a solute that is not dissolved, the solventserves as the dispersion medium, the solute serves as the dispersoid,and the dispersoid is easily dispersed in the dispersion medium. In thecase of the dispersion medium and the dispersoid, a high-dispersionstate can be achieved when Ra₁≤5 and an ultrahigh-dispersion state canbe achieved when Ra₁≤2.

Regarding the above-described HSP theory, in the present disclosure,focus is placed on the overlap of the Hansen spheres, and the HSPdistance Ra between the solid particles and water. That is, in mixing ofat least two types of solid particles, the non-aqueous liquid, andwater, dispersibility is evaluated based on the overlap of the Hansenspheres and the HSP distance Ra. A dispersion body that is in ahigh-dispersion state can be obtained as a result. The HSP distance Rais calculated based on expression I by using the HSP value of water asthe HSP value of the solvent B. Here, the HSP value of water is δ_(d):15.5, δ_(p): 16.0, and δ_(h): 42.3.

Measurement of the Hansen spheres and the HSP values of the solidparticles and the non-aqueous liquid is performed by reagents of atleast 14 types of pure solvents of which the HSP values are alreadyknown being classified into good solvent and poor solvent.

For example, the Hansen spheres and the HSP values are determined byanalysis software. As the analysis software, a software HSPiP Version5.2.05 developed by Dr. Hansen can be used. Details of HSPiP aredescribed at https://www.hansen-solubility.com. First, classificationresults of the solvent reagents are given scores. Next, the scores areinputted to the analysis software. Specifically, a good solvent can begiven a score 1 and a poor solvent can be given a score 0. As a result,in the analysis software, the Hansen sphere can be drawn in thethree-dimensional Hansen space in which the London dispersion forceδ_(d), the dipole-dipole force δ_(p), and the hydrogen bonding forceδ_(h) are each a coordinate axis. FIG. 1 shows an example of the Hansensphere S1 of a certain solid particle. The Hansen sphere S2 of thenon-aqueous liquid is also drawn in the Hansen space in a manner similarto that in FIG. 1 . The HSP value is determined as a center(specifically, center coordinates) of the Hansen sphere. Here, in casesin which the above-described analysis software or version is notavailable, the Hansen spheres and the HPS values can be determined byanother software or another version that is available and in whichsimilar measurement principles are used, or by calculation using similarmeasurement principles.

The classification into good solvent and poor solvent can be determinedbased on a threshold of a certain measurement value. In cases in whichthe above-described analysis software is used, the threshold can bedetermined by a fitting value being confirmed. The fitting value beingcloser to 1 means that the Hansen sphere is more correctly drawn.Therefore, the threshold can be determined such that the fitting valueis 1 or a maximum numeric value that is less than 1. Here, although thisis an empirical determination based on past experiments, sufficientmeasurement accuracy may not be achieved when the fitting value is lessthan 0.8. Therefore, in this case, the solvent reagent is preferablyreselected and measured.

The classification into good solvent and poor solvent for determiningthe Hansen spheres and the HSP values of the solid particles isperformed based on (1) confirmation of a precipitation state by a visualobservation method, (2) a measurement value of particle size by Stokes'method, (3) a measurement value of particle size by a concentratedparticle size analyzer, or (4) a measurement value of a contact angle bya permeation speed method. When (1) classification by the visualobservation method cannot be performed, (2) measurement of the particlesize by the Stokes' method is selected. When (2) measurement of theparticle size by the Stokes' method cannot be performed, (3) measurementof the particle size by the concentrated particle size analyzer isselected. When (3) measurement of the particle size by the concentratedparticle size analyzer cannot be performed, (4) measurement of thecontact angle by the permeation speed method is selected. Specificmethods will be described below. Here, the classification andmeasurements are performed under a room-temperature condition(specifically, a temperature of 20° C. to 25° C.).

(1) Visual Observation Method

The precipitation in the solvent reagent is visually confirmed. Forexample, specific steps are as in (1-1) to (1-3), described below.

(1-1) Prepare at least 14 types of solvent reagents of which the HSPvalues are already known.

(1-2) Place 0.05 g of the solid particles to be measured in 20 ml ofeach solvent reagent and shake 30 times. After the solid particles aredispersed in the solvent reagent as a result, let stand.

(1-3) Visually confirm the precipitation state of the solid particles inthe solvent reagent after 15 minutes of standing. Determine the solventreagent to be a poor solvent when precipitation is observed. Determinethe solvent reagent to be a good solvent when precipitation is notobserved. Perform the foregoing operations for the at least 14 types ofsolvent reagents.

(2) Stokes' Method

The particle size of the solid particles can be measured by the Stokes'method, and the classification into good solvent and poor solvent can beperformed based on the particle size. The solvent reagent is considereda better solvent as the particle size decreases. For example, specificsteps are as in (2-1) to (2-5), described below.

(2-1) Prepare at least 14 types of solvent reagents of which the HSPvalues are already known.

(2-2) Place 2 g of the solid particles to be measured in a 25 mLmeasuring cylinder. Next, pour the solvent reagent into the measuringcylinder up to the 20 mL line. After shaking the measuring cylinder 30times, let stand. Here, after standing, if the solid particles promptlyprecipitate in the solvent reagent in a visually observable manner, themeasurement of the particle size described hereafter is not necessarilyrequired to be performed. The solvent reagent can be determined to be apoor solvent that has poor dispersibility.

(2-3) Measure a height of an interface between a clear layer and adeposited layer three times each, at 5 minutes after, 10 minutes after,15 minutes after, 20 minutes after, and 25 minutes after standing.Calculate average values thereof. As a result, the average value of theinterface height after the elapse of each amount of time is obtained.Calculate a sedimentation rate ν (unit: cm/s) from the average values ofthe interface height and the elapsed times.

(2-4) Calculate a particle size D_(p) (unit: cm) by Stokes' law that isexpressed in expression II, below. In expression II, η: a coefficient ofviscosity of the reagent (unit: cm·s), ν: sedimentation rate (unit:cm/s), ρ_(p): density of the particles (unit: g/cm³), ρ₀: density of thereagent (unit: g/cm³), and g: acceleration of gravity. The density ofthe particles ρ_(p) is measured using a pycnometer. The acceleration ofgravity g is 980 cm/s². Perform the measurement of particle size D_(p)for the at least 14 types of solvent reagents. The particle size D_(p)is an average particle size.

(2-5) Classify the solvent reagents into good solvent and poor solventbased on a threshold of the particle size D_(p). A method fordetermining the threshold is as described above. Here, for example, theclassification can be facilitated by the solvent reagents being arrangedin order from that with the smallest particle size D_(p).

$\begin{matrix}{D_{p} = \sqrt{\frac{18\eta\nu}{\left( {\rho_{p} - \rho_{0}} \right)g}}} & {{Expression}{II}}\end{matrix}$

(3) Concentrated Particle Size Analyzer

The particle size (specifically, the average particle size) of the solidparticles can be measured using a concentrated particle size analyzer,and the classification into good solvent and poor solvent can beperformed based on the particle size. For example, for the measurement,a concentrated particle analyzer “FPAR-100,” manufactured by OtsukaElectronics Co., Ltd., is used. The solvent reagent is a better solventas the particle size decreases. For example, specific steps are as in(3-1) to (3-4), described below.

(3-1) Prepare at least 14 types of solvent reagents of which the HSPvalues are already known.

(3-2) Fabricate a dispersion liquid that has a particle concentration of5.0×10⁻⁴ g/cc using the solid particles to be measured and the solventreagent.

(3-3) Place the dispersion liquid in the concentrated particle sizeanalyzer and measure the particle size. Perform the measurement of theparticle size for the at least 14 types of solvent reagents.

(3-4) Classify the solvent reagents into good solvent and poor solventbased on a threshold of the particle size. A method for determining thethreshold is as described above. Here, for example, the classificationcan be facilitated by the solvent reagents being arranged in order fromthat with the smallest particle size.

(4) Permeation Speed Method

A contact angle between the solid particles and the solvent reagent canbe measured by the permeation speed method, and the classification intogood solvent and poor solvent can be performed based on the contactangle. The measurement is performed by a measurement apparatus 5 shownin FIG. 2 . As shown in FIG. 2 , the measurement apparatus 5 isconfigured by a lifting/lowering apparatus 51, an iron column 52, anelectronic scale 53, and a recording apparatus 54. The lifting/loweringapparatus 51 includes a lifting/lowering base 511. A beaker 55 thatcontains the solvent reagent is arranged on the lifting/lowering base511. The iron column 52 and the electronic scale 53 are connected.Weight inside the iron column 52 can be measured by the electronicscale. A lower surface of the iron column 52 is composed of a paperfiler 521. The inside of the iron column 52 is filled with powder 50 ofthe solid particles to be measured. The iron column 52 is hung above thebeaker 55. For example, the recording apparatus 54 is a computer andrecords measurement results of the electronic scale 53. For example, themeasurement of the contact angle using this measurement apparatus 5 andthe classification are specifically performed by steps (4-1) to (4-4),described below.

(4-1) Prepare at least 14 types of solvent reagents of which the HSPvalues are already known.

(4-2) Place the solvent reagent in the beaker 55. Fill the iron column52 with the powder 50 of the solid particles to be measured.

(4-3) Operate the lifting/lowering apparatus 51 and immerse a lowersurface side of the iron column 52 in the solvent reagent inside thebeaker 55. As a result, the solvent reagent permeates the powder 50 ofthe solid particles inside the iron column 52. After immersion, measurea permeation weight every second through the electronic scale 53, andrecord the measurement results by the recording apparatus 54. Thepermeation weight refers to a weight of the solvent reagent thatpermeates a filling powder (specifically, the powder 50) inside the ironcolumn 52.

(4-4) Calculate a contact angle θ (unit: °) by Washburn's equation thatis expressed in expression III, below. In expression III, l: permeationheight of the liquid (unit: m), t: permeation time (unit: s), r:capillary radius of the filling powder (unit: m), γ: surface tension ofthe liquid (unit: mN/m), and q: viscosity of the liquid (unit: mPa-s).Here, volume of the liquid (specifically, the solvent reagent) thatpermeates the inside of the column can be calculated from the densityand the permeation weight of the liquid. The permeation height 1 can becalculated from the volume and a cross-sectional area of the container.Perform the measurement of the contact angle θ for the at least 14 typesof solvent reagents.

l ² /t=r·γ cos θ/2η  Expression III

(4-5) Classify the solvent reagents into good solvent and poor solventbased on a threshold of the contact angle. The contact angle beingsmaller means that permeation of the solvent reagent into the fillingpower is faster. The solvent reagent is a better solvent as thepermeation becomes faster. Meanwhile, a larger contact angle means thatpermeation of the solvent into the filling powder is slower. The solventreagent is a poorer solvent as the permeation becomes slower. A methodfor determining the threshold is as described above. Here, for example,the classification can be facilitated by the solvent reagent beingarranged in order from that with the smallest contact angle θ.

For example, the classification into good solvent and poor solvent fordetermining the Hansen sphere of the non-aqueous liquid is performedthrough visual confirmation of the solubility of the non-aqueous liquidand the solvent reagent. Specifically, at least 14 types of solventreagents of which the HSP values are already known are prepared. One mlof the non-aqueous liquid to be measured is placed in a screw tube, and1 mL of the solvent reagent is further placed therein. After the screwtube is shaken 20 times, a state inside the tube is visually examined.The solvent reagent is determined to be a good solvent when thenon-aqueous liquid is dissolved in the solvent reagent. The solventreagent is determined to be a poor solvent when the non-aqueous liquidis not completely dissolved in the solvent reagent and a portion isseparated, or the non-aqueous liquid is completely undissolved in thesolvent reagent and both are completely separated. The determination isperformed under room-temperature conditions (specifically, a temperatureof 20° C. to 25° C.). The foregoing operation is performed on the atleast 14 types of solvent reagents.

For example, as the solvent reagent that is used in the measurement ofthe Hansen spheres of the solid particles and the non-aqueous liquid, apure solvent of which δ_(d) is 14 to 21, δ_(p) is 0 to 20, and δ_(h) is0 to 22 is selected. The HSP values and the Hansen spheres can bemeasured with higher accuracy as a number of solvent reagents increases.However, calculations can be performed with sufficiently high accuracywith 14 to 20 types. Measurement results hardly change by the numberbeing increased any further. Use of at least 14 types of solventreagents is sufficient. Table 1 shows the solvent reagents of which theHSP values are already known and the HSP values thereof. The Hansenspheres and the HSP values can be determined by at least 14 types ofsolvent reagents being used from a list shown in Table 1.

TABLE 1 Reagent HSP value Category No. Solvent reagent δ_(d) [MPa^(1/2])δp [MPa^(1/2]) δh [MPa^(1/2)] First Group R1 1-Butanol 16.0 5.7 15.8First Group R2 Tetrahydrofuran (THF) 16.8 5.7 8.0 First Group R41,4-Dioxane 17.5 1.8 9.0 First Group R6 Ethanol 15.8 8.8 19.4 FirstGroup R9 Dimethyl Sulfoxide (DMSO) 18.4 16.4 10.2 First Group R12Acetone 15.5 10.4 7.0 First Group R13 Toluene 18.0 1.4 2.0 First GroupR14 Methyl Ethyl Ketone (MEK) 16.0 9.0 5.1 First Group R15 Ethyl Acetate15.8 5.3 7.2 Second Group R3 Acetic Acid 14.5 8.0 13.5 Second Group R5Dimethyl Formamide (DMF) 17.4 13.7 11.3 Second Group R7 N-MethylFormamide 17.4 18.8 15.9 Second Group R8 2-Propanol 15.8 6.1 16.4 SecondGroup R10 Methyl Isobutyl Ketone (MIBK) 15.3 6.1 4.1 Second Group R11Cyclohexane 16.8 0.0 0.2 Second Group R22 Diacetone Alcohol 15.8 8.210.8 Third Group R16 1-Methyl Imidazole 19.7 15.6 11.2 Third Group R17Benzyl Alcohol 18.4 6.3 13.7 Third Group R18 N-Methyl-2-Pyrrolidone(NMP) 18.0 12.3 7.2 Third Group R19 Hexane 14.9 0.0 0.0 Third Group R20Ethylene Glycol Monomethyl Ether 16.0 8.2 15.0 Third Group R21 Quinoline20.5 5.6 5.7 Third Group R23 Propylene Carbonate 20.0 18.0 4.1 ThirdGroup R24 Ethanolamine 17.0 15.5 21.0 Third Group R25 o-Dichlorobenzene19.2 6.3 3.3 Third Group R26 1-Methoxy-2-Propanol 15.6 6.3 11.6 ThirdGroup R27 Bromobenzene 19.2 5.5 4.1 Third Group R28 Pyridine 19.0 8.85.9 Third Group R29 Benzyl Benzoate 20.0 5.1 5.2 Third Group R30N,N-Diethyl Formamide 16.4 11.4 9.2 Third Group R31 γ-Butyrolactone(GBL) 18.0 16.6 7.4

A method for selecting the solvent reagents to be used for measurementis not limited. However, a combination of reagents of which the values(that is, δ_(a), δ_(p), and δ_(h)) of surface energy of the solventreagents are close is preferably avoided, and a combination in which thevalues vary over a wide range is preferably selected.

Specifically, of the solvent reagents shown in Table 1, for example, thesolvent reagents that belong to a first group can all be used, and thesolvent reagents can be selectively used from a second group and a thirdgroup depending on the solid particles to be measured and thenon-aqueous liquid. Regarding the non-aqueous liquid and the solidparticles that can be measured by the visual observation method, asolvent reagent that belongs to the first group and a solvent reagentthat belongs to the second group can be used in combination. In thiscase, when the fitting value is poor, a solvent reagent from the thirdgroup is preferably additionally used such that the fitting valuebecomes closer to 1. In addition, depending on the measurement method,there are solvent reagents of which the determination of good solventand poor solvent cannot be made. Therefore, the solvent reagents can beselected from the second group and the third group based on themeasurement method.

The Hansen spheres of the solid particles and the non-aqueous liquid canbe determined as described above. In addition, the HSP value of thesolid particles is determined from the Hansen spheres. From this result,the HSP distance Ra between the solid particles and water can becalculated.

As shown in FIG. 1 , the Hansen sphere S1 is expressed in athree-dimensional space. In the manufacturing of the dispersion body,the solid particles and the non-aqueous liquid are selectively used suchthat the Hansen spheres of at least two types of solid particles and onetype of non-aqueous liquid overlap. Specific examples of overlap of theHansen spheres will be given in experiment examples.

In the manufacturing method according to the present embodiment, thedispersion body is manufactured by a plurality of types of solidparticles (specifically, powder), water, and a liquid other than waterbeing mixed. In addition, the solid particles and the liquid to be usedin the manufacturing of the dispersion body are determined based on theoverlap of the Hansen spheres and the HSP distance Ra to water. As aresult, as the solid particles and the non-aqueous liquid, a combinationthat is suitable for high dispersion can be selected. Consequently, adispersion body that has favorable dispersibility even while containingwater can be manufactured. Therefore, variations in density in thedispersion body can be reduced. In addition, changes over time inviscosity of the dispersion body can also be reduced.

The solid particles of which the Hansen sphere overlaps that of thenon-aqueous liquid are referred to, hereafter, as “liquid-affinity solidparticles,” as appropriate. The solid particles are preferably selectedsuch that a mixing ratio of one type among the liquid-affinity solidparticles is greatest among all solid particles used in themanufacturing of the dispersion body, and used in the manufacturing ofthe dispersion body. In this case, a dispersion body that has morefavorable dispersibility can be manufactured. A reason for this is thataffinity between the solid particles of which an amount used is greatestand the liquid becomes favorable. Here, the mixing ratio is mass ratio.

In addition, when, among all solid particles that are used in themanufacturing of the dispersion body, the solid particles of which theHSP distance Ra to water is the greatest is first solid particles, thefirst solid particles are preferably selected as the solid particlesthat have the greatest HSP distance Ra in the solid particle candidategroup that can be used in the manufacturing of the dispersion body. Inthis case as well, a dispersion body that has more favorabledispersibility can be manufactured. A reason for this is that affinitybetween the first solid particles of which affinity with water is lowestamong the solid particle candidate group and the liquid becomesfavorable.

Either of the selection of the solid particles of which the HSP distanceRa is the greatest and the selection of the combination of the solidparticles and the liquid of which the Hansen spheres overlap may beperformed first. That is, the order of selection may be interchanged.For example, the HSP values of the solid particle candidate group aredetermined and the solid particle candidate group is arrayed in orderfrom that with the greatest HSP distance Ra to water. Then, the solidparticles and the liquid are selected such that the Hansen spheres ofthe solid particles of which the HSP distance Ra to water is great andthe liquid overlap. The solid particles and the liquid can then be usedin the manufacturing of the dispersion body. Meanwhile, the combinationsof the solid particles and the liquids can be studied from the overlapof the Hansen spheres, first. The combination that includes the solidparticles of which the HSP distance Ra to water is great can then beselected from the combinations.

Second solid particles that are solid particles other than the firstsolid particles among the liquid-affinity solid particles are preferablyselected as the solid particles of which the HSP distance Ra is secondgreatest in the solid particle candidate group, and used in themanufacturing of the dispersion body. In this case as well, a dispersionbody that has more favorable dispersibility can be manufactured. Areason for this is that affinity between the first solid particles ofwhich affinity with water is lowest among the solid particle candidategroup, the second solid particles, and the liquid becomes favorable.

The second solid particles that are the solid particles other than thefirst solid particles among the liquid-affinity solid particles arepreferably selected as the solid particles of which the mixing ratio isgreatest or second greatest among all solid particles used in thefabrication of the dispersion body. In this case as well, a dispersionbody that has more favorable dispersibility can be manufactured. Areason for this is that affinity between the second solid particles ofwhich the amount used is large and the liquid becomes favorable. Here,the mixing ratio is mass ratio.

As described above, according to the present embodiment, a manufacturingmethod for a dispersion body that has favorable dispersibility can beprovided.

Second Embodiment

Another embodiment related to the manufacturing method for thedispersion body will be described. Here, reference numbers usedaccording to the second and subsequent embodiments that are the same asthe reference numbers used according to earlier embodiments indicateconstituent elements and the like that are similar to those according tothe earlier embodiments.

In a manner similar to the first embodiment, the dispersion body that ismanufactured according to the present embodiment is manufactured bysolid particles, water, and a non-aqueous liquid being mixed. The solidparticles and the non-aqueous liquid that are used in the manufacturingof the dispersion body are selected in a following manner.

At least two types of solid particles are selected from a solid particlecandidate group of which the HSP distance Ra to water is equal to orgreater than 28 MPa^(1/2). Then, the solid particles and the non-aqueousliquid are selected such that the Hansen spheres of the solid particlesand the Hansen sphere of at least one type of non-aqueous liquid from anon-aqueous liquid candidate group mutually overlap. As describedaccording to the first embodiment, for the HSP distance Ra between thesolid particles and water, the respective HSP values may be measured andthe distance therebetween may be calculated.

A reason for selecting the solid particles from the solid particlecandidate group of which the HSP distance Ra to water is equal to orgreater than 28 MPa^(1/2) is as follows. When the HSP distance Ra towater is equal to or greater than 28 MPa^(1/2), dispersion of the solidparticles in the water does not significantly deteriorate. Therefore, afavorable dispersion body can be obtained by mechanical energy throughkneading and stirring. Meanwhile, when the HSP distance Ra to water isless than 28 MPa^(1/2), the solid particles are likely to formaggregates with one another in the water, and the aggregates aredifficult to disperse by the above-described mechanical energy.Therefore, the solid particles are preferably selected from the solidparticle candidate group of which the HSP distance Ra to water is equalto or greater than 28 MPa^(1/2).

Through use of the solid particles and the non-aqueous liquid that areselected as described above, the dispersion body that has favorabledispersibility can be manufactured.

The solid particles are preferably selected such that the mixing ratioof at least one type of solid particles selected from the solid particlecandidate group is greatest among all solid particles used in themanufacturing of the dispersion body, and used in the manufacturing ofthe dispersion body. In this case, a dispersion body that has morefavorable dispersibility can be manufactured. A reason for this is thataffinity between the solid particles of which the amount used is thegreatest and the non-aqueous liquid become favorable. Here, the mixingratio is mass ratio. In other respects, the present embodiment can becarried out in a manner similar to the first embodiment, and similareffects are achieved.

Third Embodiment

An embodiment in which a honeycomb structure 2 is manufactured as aceramic sintered body 1 using a dispersion body will be described. Asshown in FIG. 3 , for example, the honeycomb structure 2 has a circularcylindrical outer skin 21 and partition walls 23 that partition aninterior of the outer skin 21 into numerous cells 22. The partitionwalls 23 are provided in a lattice shape. The cell 22 extends along anaxial direction X of the outer skin 21. The axial direction X of theouter skin 21 is also an axial direction X of the honeycomb structure 2.

As the honeycomb structure 2, there is a monolith substrate that is usedto carry an exhaust gas purification catalyst such as a noble metalcatalyst, and an exhaust gas purification filter that forms a sealingportion and is used to collect particulate matter in the exhaust gas.Although illustration of the sealing portion is omitted, the sealingportion is formed on both ends 28 and 29 in the axial direction X of thehoneycomb structure 2. In each cell 22, a first end 28 or a second end29 is sealed by the sealing portion. In the first end 28 or the secondend 29, the sealing portions and open portions that are not sealed bythe sealing portion are arranged in a checkerboard pattern. Hereafter,the honeycomb structure for the monolith substrate is referred to as a“first honeycomb structure” and the honeycomb structure for the exhaustgas purification filter is referred to as a “second honeycombstructure.”

The first honeycomb structure and the second honeycomb structure bothhave the honeycomb structure shown in FIG. 3 , and are composed ofcordierite, SiC, aluminum titanate, or the like. For example, even inthe case of a same cordierite, because required performance, such asheat resistance, strength, and porosity, differs between the firsthoneycomb structure and the second honeycomb structure, differing rawmaterials are used.

When the first honeycomb structure is composed of cordierite, the rawmaterial is selected from kaolin, aluminum hydroxide, silica, alumina,talc, and a pore-forming material. In addition, when the secondhoneycomb structure is composed of cordierite, the raw material isselected from silica, such as porous silica, aluminum hydroxide, talc,and a pore-forming material. Meanwhile, to improve wettability betweenthe raw material and water, and improve dispersibility, a lubricatingoil or a dispersant is used as the non-aqueous liquid.

A manufacturing method for the honeycomb structure is as follows. First,the solid particles of the raw material that is selected from acandidate group, the non-aqueous liquid that is selected from acandidate group, and water are mixed and kneaded, and a green body isthereby prepared. This green body is the dispersion body. Next, thegreen body is extruded into a honeycomb shape and a molded body isobtained. As a result of the molded body being dried and fired, thehoneycomb structure is obtained.

A green body that has favorable dispersibility can be obtained by thesolid particles and the non-aqueous liquid being selected and the greenbody being prepared as according to the first and second embodiments. Asa result, occurrence of defects, such as cracks and distortion of cells,after firing can be prevented. As a result of the dispersion bodyaccording to the first embodiment and the second embodiment being used,even in cases in which the ceramic sintered body 1 has a thin portion,such as the partition wall 23 of the honeycomb structure 2, occurrenceof an abnormality in shape in the thin portion after molding or afterfiring can be prevented. In addition, a dispersion body that is in ahigh-dispersion state can be obtained even when the amount ofnon-aqueous liquid is reduced. Therefore, imbalance in a non-aqueousliquid component within the green body is reduced. Consequently, stressduring firing is suppressed, and defects that may occur in the sinteredbody can be further prevented.

Experiment Example 1

A present example is an example in which solid particles and anon-aqueous liquid that are used to manufacture a honeycomb structurethat is composed of cordierite are selected from candidate groups.Specifically, the solid particles and the non-aqueous liquid that areused to manufacture the first honeycomb structure for the monolithsubstrate are selected.

In the present example, in the manufacturing of the first honeycombstructure, aluminum hydroxide, alumina, silica, and talc were used asthe solid particles of the raw material of the first honeycombstructure. In addition, a dispersion body was manufactured by these rawmaterials, water, and a liquid dispersant being mixed. The dispersionbody was then molded, dried, and fired and the honeycomb structure wasthereby manufactured. First, the HSP values of the solid particles andthe non-aqueous liquid that are used as the raw materials of thehoneycomb structure were measured using the method described accordingto the first embodiment.

Tables 2 to 4 show measurement targets for the HSP value, and thesolvent reagents that were used for the measurement. A circle mark inthe table indicates that the corresponding solvent reagent was used. Ablank field indicates that the corresponding solvent reagent was notused. Here, Tables 2 to 4 also show measurement targets that serve asthe manufacturing raw materials of the second honeycomb structure forthe exhaust gas purification filter, described in experiment example 2,and the solvent reagents. Here, in the tables, the measurement targetsto which a letter of the alphabet is attached indicate measurementtargets that differ in manufacturer, place of production, product name(product number), and the like.

TABLE 2 Measurement targets (solid particles) Aluminum Aluminum Reagenthydroxide hydroxide No. Category Solvent reagent A D Alumina Silica TalcA Kaolin R1 First Group 1-Butanol ∘ ∘ ∘ ∘ ∘ ∘ R2 First GroupTetrahydrofuran (THF) ∘ ∘ ∘ ∘ ∘ ∘ R3 Second Group Acetic Acid ∘ ∘ ∘ ∘ ∘R4 First Group 1,4-Dioxane ∘ ∘ ∘ ∘ ∘ ∘ R5 Second Group DimethylFormamide (DMF) ∘ ∘ ∘ ∘ ∘ ∘ R6 First Group Ethanol ∘ ∘ ∘ ∘ ∘ ∘ R7 SecondGroup N-Methyl Formamide ∘ ∘ ∘ ∘ ∘ ∘ R8 Second Group 2-Propanol ∘ ∘ ∘ ∘∘ R9 First Group Dimethyl Sulfoxide (DMSO) ∘ ∘ ∘ ∘ ∘ ∘ R10 Second GroupMethyl Isobutyl Ketone ∘ ∘ ∘ (MIBK) R11 Second Group Cyclohexane ∘ ∘ ∘ ∘∘ R12 First Group Acetone ∘ ∘ ∘ ∘ ∘ ∘ R13 First Group Toluene ∘ ∘ ∘ ∘ ∘∘ R14 First Group Methyl Ethyl Ketone (MEK) ∘ ∘ ∘ ∘ ∘ ∘ R15 First GroupEthyl Acetate ∘ ∘ ∘ ∘ ∘ ∘ R16 Third Group 1-Methyl Imidazole ∘ R17 ThirdGroup Benzyl Alcohol ∘ R18 Third Group N-Methyl-2-Pyrrolidone ∘ (NMP)R19 Third Group Hexane ∘ R20 Third Group Ethylene Glycol ∘ MonomethylEther R21 Third Group Quinoline ∘ R22 Second Group Diacetone Alcohol ∘ ∘∘ ∘

TABLE 3 Measurement target (solid particles) Aluminum Aluminum Reagenthydroxide hydroxide No. Category Solvent reagent Talc D Talc C Talc D BC Silica C R1 First Group 1-Butanol ∘ ∘ ∘ ∘ ∘ ∘ R2 First GroupTetrahydrofuran (THF) ∘ ∘ ∘ ∘ ∘ ∘ R3 Second Group Acetic Acid ∘ ∘ ∘ ∘ ∘R4 First Group 1,4-Dioxane ∘ ∘ ∘ ∘ ∘ ∘ R5 Second Group DimethylFormamide (DMF) ∘ ∘ ∘ ∘ ∘ R6 First Group Ethanol ∘ ∘ ∘ ∘ ∘ ∘ R7 SecondGroup N-Methyl Formamide ∘ ∘ ∘ ∘ ∘ R8 Second Group 2-Propanol ∘ ∘ ∘ ∘ R9First Group Dimethyl Sulfoxide (DMSO) ∘ ∘ ∘ ∘ ∘ ∘ R10 Second GroupMethyl Isobutyl Ketone ∘ ∘ ∘ (MIBK) R11 Second Group Cyclohexane ∘ ∘ ∘ ∘R12 First Group Acetone ∘ ∘ ∘ ∘ ∘ ∘ R13 First Group Toluene ∘ ∘ ∘ ∘ ∘ ∘R14 First Group Methyl Ethyl Ketone (MEK) ∘ ∘ ∘ ∘ ∘ ∘ R15 First GroupEthyl Acetate ∘ ∘ ∘ ∘ ∘ ∘ R18 Third Group N-Methyl-2-Pyrrolidone ∘ (NMP)R22 Third Group Diacetone Alcohol ∘ ∘ ∘ R25 Third Groupo-Dichlorobenzene ∘ R26 Third Group 1-Methoxy-2-Propanol ∘ R27 ThirdGroup Bromobenzene ∘ R28 Third Group Pyridine ∘ R29 Third Group BenzylBenzoate ∘ R30 Third Group N,N-Diethyl Formamide ∘ R31 Third Groupγ-Butyrolactone (GBL) ∘

TABLE 4 Reagent Measurement target (solid particles) No. CategorySolvent reagent Canola oil Dispersant A Dispersant B Dispersant C R1First Group 1-Butanol ∘ ∘ ∘ ∘ R2 First Group Tetrahydrofuran (THF) ∘ ∘ ∘∘ R3 Second Group Acetic Acid ∘ ∘ ∘ R4 First Group 1,4-Dioxane ∘ ∘ ∘ ∘R5 Second Group Dimethyl Formamide (DMF) ∘ ∘ ∘ ∘ R6 First Group Ethanol∘ ∘ ∘ ∘ R7 Second Group N-Methyl Formamide ∘ ∘ ∘ R8 Second Group2-Propanol ∘ ∘ ∘ ∘ R9 First Group Dimethyl Sulfoxide (DMSO) ∘ ∘ ∘ ∘ R10Second Group Methyl Isobutyl Ketone ∘ ∘ ∘ ∘ (MIBK) R11 Second GroupCyclohexane ∘ ∘ ∘ ∘ R12 First Group Acetone ∘ ∘ ∘ ∘ R13 First GroupToluene ∘ ∘ ∘ ∘ R14 First Group Methyl Ethyl Ketone (MEK) ∘ ∘ ∘ ∘ R15First Group Ethyl Acetate ∘ ∘ ∘ ∘ R19 Third Group Hexane ∘ ∘ R22 ThirdGroup Diacetone Alcohol ∘ ∘ ∘ ∘ R23 Third Group Propylene Carbonate ∘ ∘∘ ∘ R24 Third Group Ethanolamine ∘ ∘

Table 5 shows measurement results of the HSP values of the solidparticles and the HSP distance Ra to water. Table 6 shows measurementresults of the HSP values of the non-aqueous liquids. In addition, Table7 to Table 22 show classification results of the solvent reagents thatare used for measurement of the HSP values of the solid particles andthe non-aqueous liquids that serve as the measurement targets. Score 1indicates a good solvent and a score 0 indicates a poor solvent. Here,“-” in Table 7, Table 8, and Table 10 to Table 14 indicates thatdetermination was made based on visual observation. Illustration of thethree-dimensional Hansen sphere for each measurement target is omitted.However, for example, a Hansen sphere similar to that in FIG. 1 can beobtained through software.

TABLE 5 HSP HSP value distance Measurement Measurement Manufacturer,place of δ_(d) δ_(p) δ_(h) Fitting Measurement Ra to target No. targetproduction [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] value method water S1Aluminum Manufacturer A 16.7 4.6 12.0 1.000 Stokes' method 32.5hydroxide A S2 Aluminum Manufacturer B 16.1 7.0 15.5 1.000 Concentratedparticle 28.3 hydroxide D size analyzer S3 Alumina Manufacturer C 15.97.4 13.5 1.000 Visual observation 30.1 method S4 Silica Manufacturer D15.1 8.4 16.6 1.000 Stokes' method 26.8 S5 Kaolin Manufacturer E 16.612.4 16.1 1.000 Stokes' method 26.5 S6 Talc A Manufacturer F 15.4 7.96.1 1.000 Stokes' method 37.1 S7 Talc B Manufacturer G 16.9 10.5 14.81.000 Stokes' method 28.2 Place of production A S8 Talc C Manufacturer G14.8 7.7 6.5 1.000 Stokes' method 36.8 Place of production B S9 Talc DManufacturer G 18.8 12.0 13.0 0.857 Visual observation 30.3 Place ofproduction C method S10 Aluminum Manufacturer H 12.6 15.2 14.8 0.822Visual observation 28.1 hydroxide B method S11 Aluminum Manufacturer I16.7 12.3 15.8 1.000 Visual observation 26.9 hydroxide C method S12Porous silica Manufacturer J 17.4 6.6 4.6 0.993 Permeation speed 39.0method

TABLE 6 HSP value Measurement Measurement δ_(d) δ_(p) δ_(h) FittingMeasurement target No. target Product number [MPa^(1/2)] [MPa^(1/2)][MPa^(1/2)] value method L1 Canola oil — 15.9 7.6 6.4 0.822 Visualobservation method L2 Dispersant A Unilube* 50MB-26 12.9 7.9 7.9 1.000Visual observation method L3 Dispersant B Unilube* 750E-25 13.2 7.4 8.50.993 Visual observation method L4 Dispersant C Unilube* 25TG-55 19.38.4 6.1 0.993 Visual observation method *Unilube is a registeredtrademark.

TABLE 7 Aluminum hydroxide A HSP value Solvent Solvent Average Reagentδ_(d) δ_(p) δ_(h) density viscosity particle size No. Category Solventreagent [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] [nm] ScoreR1 First Group 1-Butanol 16.0 5.7 15.8 810 0.002571 6784 1 R2 FirstGroup Tetrahydrofuran 16.8 5.7 8.0 886 0.00046 8660 1 (THF) R3 SecondGroup Acetic Acid 14.5 8.0 13.5 1050 0.001066 9709 0 R4 First Group1,4-Dioxane 17.5 1.8 9.0 1030 0.001204 12120 0 R5 Second Group Dimethyl17.4 13.7 11.3 944 0.000802 12168 0 Formamide (DMF) R6 First GroupEthanol 15.8 8.8 19.4 789 0.001082 13653 0 R7 Second Group N-Methyl 17.418.8 15.9 1011 0.00165 19031 0 Formamide R8 Second Group 2-Propanol 15.86.1 16.4 786 0.00255 20932 0 R9 First Group Dimethyl Sulfoxide 18.4 16.410.2 1101 0.001991 21435 0 (DMSO) R10 Second Group Methyl Isobutyl 15.36.1 4.1 802 0.0005463 — 0 Ketone (MIBK) R11 Second Group Cyclohexane16.8 0.0 0.2 779 0.000629 — 0 R12 First Group Acetone 15.5 10.4 7.0 7880.000303 — 0 R13 First Group Toluene 18.0 1.4 2.0 867 0.0005525 — 0 R14First Group Methyl Ethyl 16.0 9.0 5.1 805 0.00078 — 0 Ketone (MEK) R15First Group Ethyl Acetate 15.8 5.3 7.2 902 0.000426 — 0

TABLE 8 Aluminum hydroxide D HSP value Average Reagent δ_(d) δ_(p) δ_(h)particle size No. Category Solvent reagent [MPa^(1/2)] [MPa^(1/2)][MPa^(1/2)] [nm] Score R12 First Group Acetone 15.5 10.4 7.0 — 0 R16Third Group 1-Methyl Imidazole 19.7 15.6 11.2 — 0 R17 Third Group BenzylAlcohol 18.4 6.3 13.7 1428.2 0 R9 First Group Dimethyl Sulfoxide 18.416.4 10.2 1167.8 0 (DMSO) R5 Second Group Dimethyl Formamide 17.4 13.711.3 1119.7 0 (DMF) R18 Third Group N-Methyl-2- 18.0 12.3 7.2 1673.2 0Pyrrolidone (NMP) R2 First Group Tetrahydrofuran (THF) 16.8 5.7 8.0 — 0R13 First Group Toluene 18.0 1.4 2.0 — 0 R4 First Group 1,4-Dioxane 17.51.8 9.0 — 0 R19 Third Group Hexane 14.9 0.0 0.0 — 0 R1 First Group1-Butanol 16.0 5.7 15.8 970.4 1 R6 First Group Ethanol 15.8 8.8 19.41160.1 0 R7 Second Group N-Methyl Formamide 17.4 18.8 15.9 1306.2 0 R15First Group Ethyl Acetate 15.8 5.3 7.2 — 0 R20 Third Group EthyleneGlycol 16.0 8.2 15.0 1055.9 1 Monomethyl Ether R21 Third Group Quinoline20.5 5.6 5.7 — 0 R14 First Group Methyl Ethyl Ketone 16.0 9.0 5.1 — 0(MEK)

TABLE 9 Alumina HSP value Reagent δ_(d) δ_(p) δ_(h) Solvent densitySolvent viscosity No. Category Solvent reagent [MPa^(1/2)] [MPa^(1/2)][MPa^(1/2)] [kg/m³] [Pa · s] Score R1 First Group 1-Butanol 16.0 5.715.8 810 0.002571 1 R22 Third Group Diacetone Alcohol 15.8 8.2 10.8 9380.003193 1 R3 Second Group Acetic Acid 14.5 8.0 13.5 1050 0.001066 1 R8Second Group 2-Propanol 15.8 6.1 16.4 786 0.00255 0 R6 First GroupEthanol 15.8 8.8 19.4 789 0.001082 0 R9 First Group Dimethyl Sulfoxide18.4 16.4 10.2 1101 0.001991 0 (DMSO) R5 Second Group Dimethyl 17.4 13.711.3 944 0.000802 0 Formamide (DMF) R7 Second Group N-Methyl 17.4 18.815.9 1011 0.00165 0 Formamide R11 Second Group Cyclohexane 16.8 0.0 0.2779 0.000629 0 R12 First Group Acetone 15.5 10.4 7.0 788 0.000303 0 R13First Group Toluene 18.0 1.4 2.0 867 0.0005525 0 R4 First Group1,4-Dioxane 17.5 1.8 9.0 1030 0.001204 0 R2 First Group Tetrahydrofuran16.8 5.7 8.0 886 0.00046 0 (THF) R14 First Group Methyl Ethyl Ketone16.0 9.0 5.1 805 0.00078 0 (MEK) R15 First Group Ethyl Acetate 15.8 5.37.2 902 0.000426 0

TABLE 10 Silica HSP value Solvent Solvent Average Reagent δ_(d) δ_(p)δ_(h) density viscosity particle size No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] [nm] Score R8Second Group 2-Propanol 15.8 6.1 16.4 786 0.00255 3576 1 R3 Second GroupAcetic Acid 14.5 8.0 13.5 1050 0.001066 4872 1 R6 First Group Ethanol15.8 8.8 19.4 789 0.001082 6391 R22 Third Group Diacetone Alcohol 15.88.2 10.8 938 0.003193 7685 0 R14 First Group Methyl Ethyl 16.0 9.0 5.1805 0.00078 7750 0 Ketone (MEK) R1 First Group 1-Butanol 16.0 5.7 15.8810 0.002571 8150 0 R10 Second Group Methyl Isobutyl 15.3 6.1 4.1 8020.0005463 — 0 Ketone (MIBK) R11 Second Group Cyclohexane 16.8 0.0 0.2779 0.000629 — 0 R12 First Group Acetone 15.5 10.4 7.0 788 0.000303 — 0R13 First Group Toluene 18.0 1.4 2.0 867 0.0005525 — 0 R4 First Group1,4-Dioxane 17.5 1.8 9.0 1030 0.001204 — 0 R2 First GroupTetrahydrofuran 16.8 5.7 8.0 886 0.00046 — 0 (THF) R5 Second GroupDimethyl 17.4 13.7 11.3 944 0.000802 — 0 Formamide (DMF) R15 First GroupEthyl Acetate 15.8 5.3 7.2 902 0.000426 — 0 R9 First Group DimethylSulfoxide 18.4 16.4 10.2 1101 0.001991 — 0 (DMSO) R7 Second GroupN-Methyl 17.4 18.8 15.9 1011 0.00165 — 0 Formamide

TABLE 11 Kaolin HSP value Solvent Solvent Average Reagent δ_(d) δ_(p)δ_(h) density viscosity particle size No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] [nm] Score R6 FirstGroup Ethanol 15.8 8.8 19.4 786 0.001082 2510 1 R5 Second Group Dimethyl17.4 13.7 11.3 1050 0.000802 3209 1 Formamide (DMF) R7 Second GroupN-Methyl 17.4 18.8 15.9 789 0.00165 3742 1 Formamide R8 Second Group2-Propanol 15.8 6.1 16.4 938 0.00255 4837 1 R22 Third Group DiacetoneAlcohol 15.8 8.2 10.8 805 0.003193 5078 0 R9 First Group DimethylSulfoxide 18.4 16.4 10.2 810 0.001991 5480 0 (DMSO) R1 First Group1-Butanol 16.0 5.7 15.8 802 0.002571 13547 0 R3 Second Group Acetic Acid14.5 8.0 13.5 779 0.001066 19878 0 R11 Second Group Cyclohexane 16.8 0.00.2 788 0.000629 — 0 R12 First Group Acetone 15.5 10.4 7.0 867 0.000303— 0 R13 First Group Toluene 18.0 1.4 2.0 1030 0.0005525 — 0 R4 FirstGroup 1,4-Dioxane 17.5 1.8 9.0 886 0.001204 — 0 R2 First GroupTetrahydrofuran 16.8 5.7 8.0 786 0.00046 — 0 (THF) R14 First GroupMethyl Ethyl 16.0 9.0 5.1 1050 0.00078 — 0 Ketone (MEK) R15 First GroupEthyl Acetate 15.8 5.3 7.2 789 0.000426 — 0

TABLE 12 Talc A HSP value Solvent Solvent Average Reagent δ_(d) δ_(p)δ_(h) density viscosity particle size No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] [nm] Score R12First Group Acetone 15.5 10.4 7.0 788 0.000303 2298 1 R10 Second GroupMethyl Isobutyl 15.3 6.1 4.1 802 0.0005463 3216 1 Ketone (MIBK) R14First Group Methyl Ethyl 16.0 9.0 5.1 802 0.0005463 3719 1 Ketone (MEK)R6 First Group Ethanol 15.8 8.8 19.4 789 0.001082 4186 0 R5 Second GroupDimethyl 17.4 13.7 11.3 944 0.000802 4870 0 Formamide (DMF) R8 SecondGroup 2-Propanol 15.8 6.1 16.4 786 0.00255 6165 0 R1 First Group1-Butanol 16.0 5.7 15.8 810 0.002571 6267 0 R7 Second Group N-Methyl17.4 18.8 15.9 1011 0.00165 6913 0 Formamide R9 First Group DimethylSulfoxide 18.4 16.4 10.2 1101 0.001991 8309 0 (DMSO) R22 Third GroupDiacetone Alcohol 15.8 8.2 10.8 938 0.003193 8927 0 R2 First GroupTetrahydrofuran 16.8 5.7 8.0 836 0.00046 18094 0 (THF) R3 Second GroupAcetic Acid 14.5 8.0 13.5 1050 0.001066 18776 0 R15 First Group EthylAcetate 15.8 5.3 7.2 902 0.000426 — 0 R4 First Group 1,4-Dioxane 17.51.8 9.0 1030 0.001204 — 0 R13 First Group Toluene 18.0 1.4 2.0 8670.0005525 — 0 R11 Second Group Cyclohexane 16.8 0.0 0.2 779 0.000629 — 0

TABLE 13 Talc B HSP value Solvent Solvent Average Reagent δ_(d) δ_(p)δ_(h) density viscosity particle size No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] [nm] Score R8Second Group 2-Propanol 15.8 6.1 16.4 786 0.00255 486 1 R5 Second GroupDimethyl 17.4 13.7 11.3 944 0.000802 510 1 Formamide (DMF) R7 SecondGroup N-Methyl 17.4 18.8 15.9 1011 0.00165 619 0 Formamide R12 FirstGroup Acetone 15.5 10.4 7.0 788 0.000303 629 0 R6 First Group Ethanol15.8 8.8 19.4 789 0.001082 673 0 R14 First Group Methyl Ethyl 16.0 9.05.1 805 0.00078 675 0 Ketone (MEK) R9 First Group Dimethyl Sulfoxide18.4 16.4 10.2 1101 0.001991 804 0 (DMSO) R1 First Group 1-Butanol 16.05.7 15.8 810 0.002571 814 0 R2 First Group Tetrahydrofuran 16.8 5.7 8.0886 0.00046 — 0 (THF) R3 Second Group Acetic Acid 14.5 8.0 13.5 10500.001066 — 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 1030 0.001204 — 0R11 Second Group Cyclohexane 16.8 0.0 0.2 779 0.000629 — 0 R13 FirstGroup Toluene 18.0 1.4 2.0 867 0.0005525 — 0 R15 First Group EthylAcetate 15.8 5.3 7.2 902 0.000426 — 0

TABLE 14 Talc C HSP value Solvent Solvent Average Reagent δ_(d) δ_(p)δ_(h) density viscosity particle size No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] [nm] Score R10Second Group Methyl Isobutyl 15.3 6.1 4.1 802 0.000546 695 1 Ketone(MIBK) R12 First Group Acetone 15.5 10.4 7.0 788 0.000303 702 1 R5Second Group Dimethyl 17.4 13.7 11.3 944 0.000802 851 0 Formamide (DMF)R6 First Group Ethanol 15.8 8.8 19.4 789 0.001082 900 0 R9 First GroupDimethyl Sulfoxide 18.4 16.4 10.2 1101 0.001991 1137 0 (DMSO) R8 SecondGroup 2-Propanol 15.8 6.1 16.4 786 0.00255 1037 0 R1 First Group1-Butanol 16.0 5.7 15.8 810 0.002571 1050 0 R7 Second Group N-Methyl17.4 18.8 15.9 1011 0.00165 1090 0 Formamide R14 First Group MethylEthyl 16.0 9.0 5.1 805 0.00078 1198 0 Ketone (MEK) R2 First GroupTetrahydrofuran 16.8 5.7 8.0 886 0.00046 — 0 (THF) R3 Second GroupAcetic Acid 14.5 8.0 13.5 1050 0.001066 — 0 R4 First Group 1,4-Dioxane17.5 1.8 9.0 1030 0.001204 — 0 R11 Second Group Cyclohexane 16.8 0.0 0.2779 0.000629 — 0 R13 First Group Toluene 18.0 1.4 2.0 867 0.0005525 — 0R15 First Group Ethyl Acetate 15.8 5.3 7.2 902 0.000426 — 0

TABLE 15 Talc D HSP value Reagent δ_(d) δ_(p) δ_(h) Solvent densitySolvent viscosity No. Category Solvent reagent [MPa^(1/2)] [MPa^(1/2)][MPa^(1/2)] [kg/m³] [Pa · s] Score R1 First Group 1-Butanol 16.0 5.715.8 820 0.002571 1 R22 Third Group Diacetone Alcohol 15.8 8.2 10.8 9380.003193 1 R8 Second Group 2-Propanol 15.8 6.1 16.4 786 0.00255 1 R9First Group Dimethyl Sulfoxide 18.4 16.4 10.2 1101 0.001991 1 (DMSO) R5Second Group Dimethyl 17.4 13.7 11.3 944 0.000802 1 Formamide (DMF) R7Second Group N-Methyl 17.4 18.8 15.9 1011 0.00165 1 Formamide R14 FirstGroup Methyl Ethyl 16.0 9.0 5.1 805 0.00078 1 Ketone (MEK) R11 SecondGroup Cyclohexane 16.8 0.0 0.2 779 0.000629 0 R12 First Group Acetone15.5 10.4 7.0 788 0.000303 0 R13 First Group Toluene 18.0 1.4 2.0 8670.0005525 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 1030 0.001204 0 R2First Group Tetrahydrofuran 16.8 5.7 8.0 886 0.00046 0 (THF) R15 FirstGroup Ethyl Acetate 15.8 5.3 7.2 902 0.000426 0 R3 Second Group AceticAcid 14.5 8.0 13.5 1050 0.001066 0 R6 First Group Ethanol 15.8 8.8 19.4789 0.001082 0

TABLE 16 Canola oil HSP value Reagent δ_(d) δ_(p) δ_(h) No. CategorySolvent reagent [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] Score R12 FirstGroup Acetone 15.5 10.4 7.0 1 R14 First Group Methyl Ethyl Ketone (MEK)16.0 9.0 5.1 1 R15 First Group Ethyl Acetate 15.8 5.3 7.2 1 R2 FirstGroup Tetrahydrofuran (THF) 16.8 5.7 8.0 1 R10 Second Group MethylIsobutyl Ketone (MIBK) 15.3 6.1 4.1 1 R13 First Group Toluene 18.0 1.42.0 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 0 R11 Second GroupCyclohexane 16.8 0.0 0.2 0 R22 Third Group Diacetone Alcohol 15.8 8.210.8 0 R3 Second Group Acetic Acid 14.5 8.0 13.5 0 R8 Second Group2-Propanol 15.8 6.1 16.4 0 R5 Second Group Dimethyl Formamide (DMF) 17.413.7 11.3 0 R1 First Group 1-Butanol 16.0 5.7 15.8 0 R6 First GroupEthanol 15.8 8.8 19.4 0 R9 First Group Dimethyl Sulfoxide (DMSO) 18.416.4 10.2 0 R7 Second Group N-Methyl Formamide 17.4 18.8 15.9 0 R23Third Group Propylene Carbonate 20.0 18.0 4.1 0 R24 Third GroupEthanolamine 17.0 15.5 21.0 0

TABLE 17 Dispersant A HSP value Reagent δ_(d) δ_(p) δ_(h) No. CategorySolvent reagent [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] Score R3 SecondGroup Acetic Acid 14.5 8.0 13.5 1 R10 Second Group Methyl IsobutylKetone (MIBK) 15.3 6.1 4.1 1 R12 First Group Acetone 15.5 10.4 7.0 1 R2First Group Tetrahydrofuran (THF) 16.8 5.7 8.0 1 R5 Second GroupDimethyl Formamide (DMF) 17.4 13.7 11.3 0 R14 First Group Methyl EthylKetone (MEK) 16.0 9.0 5.1 0 R22 Third Group Diacetone Alcohol 15.8 8.210.8 0 R1 First Group 1-Butanol 16.0 5.7 15.8 0 R7 Second Group N-MethylFormamide 17.4 18.8 15.9 0 R23 Third Group Propylene Carbonate 20.0 18.04.1 0 R15 First Group Ethyl Acetate 15.8 5.3 7.2 0 R9 First GroupDimethyl Sulfoxide (DMSO) 18.4 16.4 10.2 0 R13 First Group Toluene 18.01.4 2.0 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 0 R6 First GroupEthanol 15.8 8.8 19.4 0 R8 Second Group 2-Propanol 15.8 6.1 16.4 0 R11Second Group Cyclohexane 16.8 0.0 0.2 0 R19 Third Group Hexane 14.9 0.00.0 0

TABLE 18 Dispersant B HSP value Reagent δ_(d) δ_(p) δ_(h) No. CategorySolvent reagent [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] Score R3 SecondGroup Acetic Acid 14.5 8.0 13.5 1 R12 First Group Acetone 15.5 10.4 7.01 R2 First Group Tetrahydrofuran (THF) 16.8 5.7 8.0 1 R5 Second GroupDimethyl Formamide (DMF) 17.4 13.7 11.3 0 R14 First Group Methyl EthylKetone (MEK) 16.0 9.0 5.1 0 R22 Third Group Diacetone Alcohol 15.8 8.210.8 0 R1 First Group 1-Butanol 16.0 5.7 15.8 0 R7 Second Group N-MethylFormamide 17.4 18.8 15.9 0 R23 Third Group Propylene Carbonate 20.0 18.04.1 0 R15 First Group Ethyl Acetate 15.8 5.3 7.2 0 R9 First GroupDimethyl Sulfoxide (DMSO) 18.4 16.4 10.2 0 R13 First Group Toluene 18.01.4 2.0 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 0 R6 First GroupEthanol 15.8 8.8 19.4 0 R8 Second Group 2-Propanol 15.8 6.1 16.4 0 R10Second Group Methyl Isobutyl Ketone (MIBK) 15.3 6.1 4.1 0 R11 SecondGroup Cyclohexane 16.8 0.0 0.2 0 R19 Third Group Hexane 14.9 0.0 0.0 0

TABLE 19 Dispersant C HSP value Reagent δ_(d) δ_(p) δ_(h) No. CategorySolvent reagent [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] Score R2 First GroupTetrahydrofuran (THF) 16.8 5.7 8.0 1 R15 First Group Ethyl Acetate 15.85.3 7.2 1 R5 Second Group Dimethyl Formamide (DMF) 17.4 13.7 11.3 1 R4First Group 1,4-Dioxane 17.5 1.8 9.0 1 R13 First Group Toluene 18.0 1.42.0 1 R14 First Group Methyl Ethyl Ketone (MEK) 16.0 9.0 5.1 1 R12 FirstGroup Acetone 15.5 10.4 7.0 1 R9 First Group Dimethyl Sulfoxide (DMSO)18.4 16.4 10.2 0 R24 Third Group Ethanolamine 17.0 15.5 21.0 0 R22 ThirdGroup Diacetone Alcohol 15.8 8.2 10.8 0 R8 Second Group 2-Propanol 15.86.1 16.4 0 R10 Second Group Methyl Isobutyl Ketone (MIBK) 15.3 6.1 4.1 0R6 First Group Ethanol 15.8 8.8 19.4 0 R23 Third Group PropyleneCarbonate 20.0 18.0 4.1 0 R11 Second Group Cyclohexane 16.8 0.0 0.2 0 R1First Group 1-Butanol 16.0 5.7 15.8 0

TABLE 20 Aluminum hydroxide B HSP value Reagent δ_(d) δ_(p) δ_(h)Solvent density Solvent viscosity No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] Score R3 SecondGroup Acetic Acid 14.5 8.0 13.5 1050 0.001066 1 R22 Third GroupDiacetone Alcohol 15.8 8.2 10.8 938 0.003193 1 R7 Second Group N-Methyl17.4 18.8 15.9 1011 0.00165 1 Formamide R1 First Group 1-Butanol 16.05.7 15.8 810 0.002571 1 R10 Second Group Methyl Isobutyl 15.3 6.1 4.1802 0.000546 0 Ketone (MIBK) R2 First Group Tetrahydrofuran 16.8 5.7 8.0886 0.00046 0 (THF) R12 First Group Acetone 15.5 10.4 7.0 788 0.000303 0R5 Second Group Dimethyl 17.4 13.7 11.3 944 0.000802 0 Formamide (DMF)R6 First Group Ethanol 15.8 8.8 19.4 789 0.001082 0 R8 Second Group2-Propanol 15.8 6.1 16.4 786 0.00255 0 R9 First Group Dimethyl Sulfoxide18.4 16.4 10.2 1101 0.001991 0 (DMSO) R14 First Group Methyl Ethyl 16.09.0 5.1 805 0.00078 0 Ketone (MEK) R4 First Group 1,4-Dioxane 17.5 1.89.0 1030 0.001204 0 R11 Second Group Cyclohexane 16.8 0.0 0.2 7790.000629 0 R13 First Group Toluene 18.0 1.4 2.0 867 0.0005525 0 R15First Group Ethyl Acetate 15.8 5.3 7.2 902 0.000426 0

TABLE 21 Aluminum hydroxide C HSP value Reagent δ_(d) δ_(p) δ_(h)Solvent density Solvent viscosity No. Category Solvent reagent[MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [kg/m³] [Pa · s] Score R1 FirstGroup 1-Butanol 16.0 5.7 15.8 810 0.002571 1 R22 Third Group DiacetoneAlcohol 15.8 8.2 10.8 938 0.003193 1 R8 Second Group 2-Propanol 15.8 6.116.4 786 0.00255 1 R3 Second Group Acetic Acid 14.5 8.0 13.5 10500.001066 1 R6 First Group Ethanol 15.8 8.8 19.4 789 0.001082 1 R5 SecondGroup Dimethyl 17.4 13.7 11.3 944 0.000802 1 Formamide (DMF) R7 SecondGroup N-Methyl 17.4 18.8 15.9 1011 0.00165 1 Formamide R9 First GroupDimethyl Sulfoxide 18.4 16.4 10.2 1101 0.001991 0 (DMSO) R14 First GroupMethyl Ethyl 16.0 9.0 5.1 805 0.00078 0 Ketone (MEK) R11 Second GroupCyclohexane 16.8 0.0 0.2 779 0.000629 0 R12 First Group Acetone 15.510.4 7.0 788 0.000303 0 R13 First Group Toluene 18.0 1.4 2.0 8670.0005525 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 1030 0.001204 0 R2First Group Tetrahydrofuran 16.8 5.7 8.0 886 0.00046 0 (THF) R15 FirstGroup Ethyl Acetate 15.8 5.3 7.2 902 0.000426 0 R10 Second Group MethylIsobutyl 15.3 6.1 4.1 802 0.000546 0 Ketone (MIBK)

TABLE 22 Porous silica HSP value Reagent δ_(d) δ_(p) δ_(h) Contact angleNo. Category Solvent reagent [MPa^(1/2)] [MPa^(1/2)] [MPa^(1/2)] [°]Score R25 Third Group o-Dichlorobenzene 19.2 6.3 3.3 7 1 R2 First GroupTetrahydrofuran (THF) 16.8 5.7 8.0 43 1 R1 First Group 1-Butanol 16.05.7 15.8 44 0 R26 Third Group 1-Methoxy-2-Propanol 15.6 6.3 11.6 45 0 R6First Group Ethanol 15.8 8.8 19.4 46 0 R27 Third Group Bromobenzene 19.25.5 4.1 50 0 R15 First Group Ethyl Acetate 15.8 5.3 7.2 52 0 R28 ThirdGroup Pyridine 19.0 8.8 5.9 52 0 R29 Third Group Benzyl Benzoate 20.05.1 5.2 52 0 R4 First Group 1,4-Dioxane 17.5 1.8 9.0 52 0 R14 FirstGroup Methyl Ethyl Ketone 16.0 9.0 5.1 54 0 (MEK) R12 First GroupAcetone 15.5 10.4 7.0 56 0 R18 Third Group N-Methyl-2- 18.0 12.3 7.2 580 Pyrrolidone (NMP) R30 Third Group N,N-Diethyl Formamide 16.4 11.4 9.258 0 R31 Third Group γ-Butyrolactone (GBL) 18.0 16.6 7.4 60 0 R9 FirstGroup Dimethyl Sulfoxide 18.4 16.4 10.2 66 0 (DMSO) R13 First GroupToluene 18.0 1.4 2.0 74 0

As shown in Table 5 to Table 22, the classification of the solventreagents for the solid particles and the non-aqueous liquids to bemeasured can be performed by the method described according to the firstembodiment. Based on the results thereof, the Hansen spheres and the HSPvalues can be measured. In addition, the HSP distances Ra of the solidparticles to water can be calculated. The Hansen sphere is ordinarilyexpressed within a three-dimensional space that is referred to as aHansen space in which the London dispersion force ad, the dipole-dipoleforce δ_(p), and the hydrogen bonding force δ_(h) are each a coordinateaxis. However, in the present experiment example 1, as shown in FIG. 4to FIG. 18 , the Hansen spheres are respectively expressed by threetwo-dimensional coordinates to clarify overlap of the Hansen spheres.Here, this also similarly applies to FIG. 19 to FIG. 26 of experimentexample 2.

(a) in FIG. 4 to FIG. 18 can be said to be diagrams in which the Hansensphere that is expressed by three-dimensional coordinates of which theLondon dispersion force ad, the dipole-dipole force δ_(p), and thehydrogen bonding force δ_(h) are the axes is projected ontotwo-dimensional coordinates of which the London dispersion force δ_(d)and the dipole-dipole force δ_(p) are the axes. That is, (a) in FIG. 4to FIG. 18 show an outer shape of the Hansen sphere on thetwo-dimensional coordinates of which the London dispersion force ad andthe dipole-dipole force δ_(p) are the axes. (b) in FIG. 4 to FIG. 18 canbe said to be diagrams in which the Hansen sphere that is expressed bythree-dimensional coordinates is projected onto two-dimensionalcoordinates of which the dipole-dipole force δ_(p) and the hydrogenbonding force δ_(h) are the axes. That is, (b) in FIG. 4 to FIG. 18 showan outer shape of the Hansen sphere on the two-dimensional coordinatesof which the dipole-dipole force δ_(p) and the hydrogen bonding forceδ_(h) are the axes. (c) in FIG. 4 to FIG. 18 can be said to be diagramsin which the Hansen sphere that is expressed by three-dimensionalcoordinates is projected onto two-dimensional coordinates of which theLondon dispersion force ad and the hydrogen bonding force δ_(h) are theaxes. That is, (c) in FIG. 4 to FIG. 18 show an outer shape of theHansen sphere on the two-dimensional coordinates of which the Londondispersion force ad and the hydrogen bonding force δ_(h) are the axes.Here, this also similarly applies to FIG. 19 to FIG. 26 in experimentexample 2, described hereafter.

Here, the Hansen spheres shown in FIG. 4 to FIG. 26 are those of thefollowing solid particles and non-aqueous liquids. The Hansen sphere S11is the Hansen sphere of aluminum hydroxide A. The Hansen sphere S12 isthe Hansen sphere of aluminum hydroxide D. The Hansen sphere S13 is theHansen sphere of talc A. The Hansen sphere S14 is the Hansen sphere oftalc B. The Hansen sphere S15 is the Hansen sphere of talc C. The Hansensphere S16 is the Hansen sphere of talc D. The Hansen sphere S17 is theHansen sphere of porous silica. The Hansen sphere S21 is the Hansensphere of canola oil. The Hansen sphere S22 is the Hansen sphere of adispersant A. The Hansen sphere S23 is the Hansen sphere of a dispersantB. The Hansen sphere S24 is the Hansen sphere of a dispersant C.

As shown in examples 1 to 12 and comparative examples 1 to 4 in Table 23and Table 24, the solid particles and the dispersants that serve as theraw materials for the monolith substrate were selected. “o” in aselection field indicates that the solid particles or the non-aqueousliquid is selected. A blank field indicates that the solid particles orthe non-aqueous liquid is not selected. The selection was performedbased on the HSP distance Ra to water and the overlap of the Hansenspheres shown in FIG. 4 to FIG. 18 , based on the above-describedmeasurement results. As shown in FIG. 8 to FIG. 18 , in examples 1 to12, the selection of the solid particles was performed such that theHansen spheres S1 of two solid particles and the Hansen sphere S2 of onetype of non-aqueous liquid mutually overlap. As shown in FIG. 4 to FIG.7 , in the solid particles and the non-aqueous liquids used in thecomparative examples 1 to 4, a combination in which the Hansen spheresS1 and S2 do not overlap is present. Here, in FIG. 4 to FIG. 18 , theHansen spheres are shown as two-dimensional circles as described above.Therefore, the overlap of Hansen spheres is expressed as overlap ofcircles. This also similarly applies to FIG. 19 to FIG. 26 in experimentexample 2, described hereafter.

The two types of solid particles and the one type of non-aqueous liquidof the combinations shown in Table 23, Table 24, and FIG. 4 to FIG. 18 ,as well as kaolin, silica, alumina, and water were mixed, and a greenbody for the first honeycomb structure was prepared. The raw materialthat has a greatest mixing amount (that is, mass ratio) among the solidparticles that are used in the manufacturing of the dispersion body(specifically, the green body for the monolith) of the present exampleis talc, and the raw material that has a second greatest mixing amountis aluminum hydroxide. In addition, as shown in Table 23 and Table 24,the raw material of which the HSP distance to water is the greatest inthe solid particle candidate group is talc A, and the raw material ofwhich the HSP distance is second greatest is talc D. Here, “o” in aHansen sphere overlap field in Table 23, Table 24, and Table 25,described hereafter, indicates that both of the Hansen spheres S1 of thetwo solid particles overlap the Hansen sphere S2 of the non-aqueousliquid. An “x” indicates that one of the Hansen spheres S1 of the twosolid particles does not overlap the Hansen sphere S2 of the non-aqueousliquid.

Next, to study dispersibility in the green bodies in examples 1 and 2and comparative examples 1 and 2, variations in green body density weremeasured. Specifically, the green body after kneading and before moldingwas removed, and measurement samples were obtained by the green bodybeing scooped out from eight random positions. The measurement samplewas placed in a measurement tool that has a diameter of 25 mm and alength of 20 mm, and compressed under conditions of a pressing speed of1 mm/min and pressure of 1 kN. Subsequently, height and weight of themeasurement sample removed from the measurement tool were measured, andthe density was calculated from the results. Next, a difference of anactual measurement value of the green body density in relation to atheoretical green body density that can be calculated based on acomposition of the raw materials in advance was calculated. When themeasurement value is less than the theoretical green body density and awidth of variance is large, this means that wettability of themeasurement sample is poor. In this case, air is present on a particlesurface and, for example, cracks and the like may occur as a result offiring. Meanwhile, if the theoretical green body density and themeasurement value are similar values, it can be said that dispersibilityis good. Results thereof are shown in Table 23.

TABLE 23 Manufacturer, Comparative example No., Example No. place of HSPCompar. Compar. Compar. Compar. production or distance example exampleexample example Example Measurement Material product name, Ra to 1 2 3 41 target No. name product number water Selection Selection SelectionSelection Selection S1 Aluminum Manufacturer A 32.5 ∘ ∘ hydroxide A S2Aluminum Manufacturer B 29.3 ∘ ∘ ∘ hydroxide D S3 Alumina Manufacturer C30.1 S4 Silica Manufacturer D 26.8 S5 Kaolin Manufacturer E 26.5 S6 TalcA Manufacturer F 37.1 ∘ S7 Talc B Manufacturer G 28.2 ∘ ∘ Place ofproduction A S8 Talc C Manufacturer G 36.8 ∘ ∘ Place of production B S9Talc D Manufacturer G 30.3 Place of production C L1 Canola oil — ∘ ∘ ∘ ∘L2 Dispersant A Unilube* 50MB-26 L3 Dispersant B Unilube* 750E-25 L4Dispersant C Unilube* 25TG-55 Result of overlap of Hansen spheres x x xx ∘ Variations in density relative to theoretical density of about aboutabout about 5% or dispersion body (green body) 10% 10% 10% 10% lessManufacturer, place of HSP Comparative example No., Example No.production or distance Example Example Example Example MeasurementMaterial product name, Ra to 2 3 4 5 target No. name product numberwater Selection Selection Selection Selection S1 Aluminum Manufacturer A32.5 ∘ ∘ ∘ ∘ hydroxide A S2 Aluminum Manufacturer B 29.3 hydroxide D S3Alumina Manufacturer C 30.1 S4 Silica Manufacturer D 26.8 S5 KaolinManufacturer E 26.5 S6 Talc A Manufacturer F 37.1 ∘ ∘ ∘ S7 Talc BManufacturer G 28.2 Place of production A S8 Talc C Manufacturer G 36.8Place of production B S9 Talc D Manufacturer G 30.3 ∘ Place ofproduction C L1 Canola oil — ∘ L2 Dispersant A Unilube* ∘ 50MB-26 L3Dispersant B Unilube* ∘ 750E-25 L4 Dispersant C Unilube* ∘ 25TG-55Result of overlap of Hansen spheres ∘ ∘ ∘ ∘ Variations in densityrelative to theoretical density of 5% or 5% or 5% or 5% or dispersionbody (green body) less less less less *Unilube is a registeredtrademark.

TABLE 24 Manufacturer, place of HSP Example No. production or distanceExample Example Example Example Example Example Measurement Materialproduct name, product Ra to 6 7 8 9 10 11 target No. name number waterSelection Selection Selection Selection Selection Selection S1 AluminumManufacturer A 32.5 ∘ ∘ ∘ ∘ ∘ ∘ hydroxide A S2 Aluminum Manufacturer B29.3 hydroxide D S3 Alumina Manufacturer C 30.1 S4 Silica Manufacturer D26.8 S5 Kaolin Manufacturer E 26.5 S6 Talc A Manufacturer F 37.1 S7 TalcB Manufacturer G 28.2 ∘ ∘ ∘ Place of production A S8 Talc C ManufacturerG 36.8 ∘ ∘ ∘ Place of production B S9 Talc D Manufacturer G 30.3 Placeof production C L1 Canola oil — — ∘ L2 Dispersant A Unilube* 50MB-26 — ∘∘ L3 Dispersant B Unilube* 750E-25 — ∘ L4 Dispersant C Unilube* 25TG-55— ∘ ∘ Result of overlap of Hansen spheres ∘ ∘ ∘ ∘ ∘ ∘ Variations indensity relative to theoretical density of dispersion body (green body)*Unilube is a registered trademark.

As is clear from Table 23 and Table 24, in the comparative examples, anaverage value of the results of the green body density that haveactually been measured is about 15% lower than the theoretical greenbody density in each case. In addition, although not shown in thetables, variations based on the extraction location of the green bodywere significant, and a location in which the actual measurement valueof the green body density was 17% lower compared to the theoreticalvalue was present. In contrast, in the examples, the variance from thetheoretical value was equal to or less than 5% in terms of averagevalue, specifically low-valued locations were not present, andvariations were small.

Furthermore, honeycomb structures were manufactured by molding, drying,and firing being performed in a manner similar to that according to thethird embodiment using the green bodies of the examples and comparativeexamples. As a result of a premise that changes are not made totemperature increase-speed conditions, in the examples, a rate ofdefects during firing was less than half in each case, in relation tothe comparative examples.

Experiment Example 2

A present example is an example in which solid particles and anon-aqueous liquid that are used to manufacture a honeycomb structurethat is composed of cordierite are selected. Specifically, the solidparticles and the non-aqueous liquid that are used to manufacture thesecond honeycomb structure for the exhaust gas purification filter areselected. The second honeycomb structure has a structure that is similarto that of the first honeycomb structure. The exhaust gas purificationfilter is formed by a sealing portion that alternately seals the cellsof the second honeycomb structure on both ends in the axial directionthereof being formed.

In the manufacturing of the second honeycomb structure for the exhaustgas purification filter, porous silica, aluminum hydroxide, and talc areused such that a desired cordierite composition is obtained. Then, adispersion body is manufactured by these raw materials, water, and aliquid dispersant being mixed. The dispersion body was then molded,dried, and fired and the honeycomb structure was thereby manufactured.

The raw materials for the exhaust gas purification filter were selectedbased on the HSP values, the HSP distances Ra to water, and the Hansenspheres of the measurement targets that were measured in experimentexample 1. The results are shown in Table 24 and FIG. 19 to FIG. 26 .The solid particles and the non-aqueous liquids were selected incombinations shown in Table 25 and FIG. 19 to FIG. 16 . These solidparticles and non-aqueous liquids, as well as aluminum hydroxide andwater were mixed, and a green body for the second honeycomb structurewas prepared. The raw material that has the greatest mixing amount (thatis, mass ratio) among the solid particles that are used in themanufacturing of the dispersion body (specifically, the green body forthe exhaust gas purification filter) of the present example is aluminumhydroxide, and the raw material that has the second greatest mixingamount is talc. In addition, the solid particles of which the HSPdistance to water is the greatest in the solid particle candidate groupis porous silica, and the solid particles of which the HSP distance isthe second greatest is talc A.

TABLE 25 Manufacturer, place of HSP Comparative example No., Example No.Measure- production or distance Compar. Compar. Compar. Compar. ExampleExample Example Example ment tar- Material product name, Ra to example 5example 6 example 7 example 8 12 13 14 15 get No. name product numberwater Selection Selection Selection Selection Selection SelectionSelection Selection S10 Aluminum Manufacturer A 28.1 hydroxide B S11Aluminum Manufacturer B 26.9 hydroxide C S12 Talc A Manufacturer F 37.1∘ ∘ ∘ ∘ S13 Talc B Manufacturer G 28.2 ∘ ∘ ∘ ∘ Place of production A S14Porous Manufacturer H 39.0 ∘ ∘ ∘ ∘ ∘ ∘ ∘ ∘ silica L1 Canola oil — — ∘ ∘L2 Dispersant Unilube* — ∘ ∘ A 50MB-26 L3 Dispersant Unilube* — ∘ ∘ B750E-25 L4 Dispersant Unilube* — ∘ ∘ C 25TG-55 Result of overlap ofHansen spheres x x x x ∘ ∘ ∘ ∘ *Unilube is a registered trademark.

As is clear from Table 25, the HSP distance Ra of porous silica to wateris 39.0. This value is the greatest among the solid particles that areused. Furthermore, as shown in Table 25 and FIG. 23 to FIG. 26 , inexample 12 to example 15, the Hansen spheres S1 of the two types ofsolid particles both overlap the Hansen sphere S2 of the non-aqueousliquid. Therefore, the green bodies of the examples can be said to havefavorable dispersibility based on the results of experiment example 2.Meanwhile, as shown in Table 25 and FIG. 19 to FIG. 22 , in comparativeexample 5 to comparative example 8, at least one of the Hansen spheresS1 of the two types of solid particles does not overlap the Hansensphere S2 of the non-aqueous liquid. Therefore, the green bodies incomparative example 5 to comparative example 8 can be said to have poordispersibility based on the results of experiment example 2.

The present disclosure is not limited to the above-described embodimentsand examples and can be applied to various embodiments without departingfrom the spirit of the invention. According to the embodiments and inthe examples, as the dispersion body, the green body that is used in themanufacturing of the honeycomb structure is mainly described. However,the present disclosure can also be applied to other technical fields inwhich solid particles such as ceramic raw materials, water, and anon-aqueous liquid are mixed. Specifically, gas sensors, solid-statebatteries, and spark plugs can be used as examples. The presenttechnology is widely applied to products that include a sintered bodysuch as ceramics.

While the present disclosure has been described with reference toembodiments thereof, it is to be understood that the disclosure is notlimited to the embodiments and constructions. The present disclosure isintended to cover various modification examples and modifications withinthe range of equivalency. In addition, various combinations andconfigurations, and further, other combinations and configurationsincluding more, less, or only a single element thereof are also withinthe spirit and scope of the present disclosure.

What is claimed is:
 1. A manufacturing method for manufacturing adispersion body by mixing a plurality of types of solid particles,water, and a liquid other than water, the manufacturing methodcomprising: selecting the solid particles and the liquid such thatHansen spheres of at least two types of the solid particles and a Hansensphere of at least one type of the liquid mutually overlap, and a Hansensolubility parameter distance to water of at least one type of the solidparticles of which the Hansen spheres overlap that of the liquid isgreatest among all solid particles used in manufacturing of thedispersion body; and using the solid particles and the liquid tomanufacture the dispersion body.
 2. The manufacturing method for adispersion body according to claim 1, further comprising: selecting thesolid particles such that a mixing ratio of one type of the solidparticles of which the Hansen spheres overlap that of the liquid isgreatest in mass ratio among all solid particles that are used in themanufacturing of the dispersion body; and using the solid particles tomanufacture the dispersion body.
 3. The manufacturing method for adispersion body according to claim 1, further comprising: selecting thesolid particles of which the Hansen solubility parameter distance is thegreatest is first solid particles, and the first solid particles as thesolid particles of which the Hansen solubility parameter distance is thegreatest in a solid particle candidate group that can be used in themanufacturing of the dispersion body; and using the solid particles tomanufacture the dispersion body.
 4. The manufacturing method for adispersion body according to claim 2, further comprising: selecting thesolid particles of which the Hansen solubility parameter distance is thegreatest is first solid particles, and the first solid particles as thesolid particles of which the Hansen solubility parameter distance is thegreatest in a solid particle candidate group that can be used in themanufacturing of the dispersion body; and using the solid particles tomanufacture the dispersion body.
 5. The manufacturing method for adispersion body according to claim 3, further comprising: selectingsecond solid particles that are solid particles other than the firstsolid particles among the solid particles of which the Hansen spheresoverlap that of the liquid as the solid particles of which the Hansensolubility parameter distance is second greatest in the solid particlecandidate group; and using the second solid particles to manufacture thedispersion body.
 6. The manufacturing method for a dispersion bodyaccording to claim 4, further comprising: selecting second solidparticles that are solid particles other than the first solid particlesamong the solid particles of which the Hansen spheres overlap that ofthe liquid as the solid particles of which the Hansen solubilityparameter distance is second greatest in the solid particle candidategroup; and using the second solid particles to manufacture thedispersion body.
 7. The manufacturing method for a dispersion bodyaccording to claim 3, further comprising: selecting second solidparticles that are solid particles other than the first solid particlesamong the solid particles of which the Hansen spheres overlap that ofthe liquid as the solid particles of which the mixing ratio is greatestor second greatest in mass ratio among all solid particles that are usedin the manufacturing of the dispersion body; and using the second solidparticles to manufacture the dispersion body.
 8. The manufacturingmethod for a dispersion body according to claim 4, further comprising:selecting second solid particles that are solid particles other than thefirst solid particles among the solid particles of which the Hansenspheres overlap that of the liquid as the solid particles of which themixing ratio is greatest or second greatest in mass ratio among allsolid particles that are used in the manufacturing of the dispersionbody; and using the second solid particles to manufacture the dispersionbody.
 9. A manufacturing method for manufacturing a dispersion body bymixing a plurality of types of solid particles, water, and a liquidother than water, the manufacturing method comprising: selecting atleast two types of solid particles from a solid particle candidate groupof which a Hansen solubility parameter distance to water is equal to orgreater than 28 MPa^(1/2); selecting the solid particles and the liquidsuch that Hansen spheres of the solid particles and a Hansen sphere ofat least one type of the liquid from a liquid candidate group mutuallyoverlap; and using the solid particles and the liquid to manufacture thedispersion body.
 10. The manufacturing method for a dispersion bodyaccording to claim 9, further comprising: selecting the solid particlessuch that a mixing ratio of at least one type of the solid particlesthat are selected from the solid particle candidate group is greatest inmass ratio among all solid particles that are used in the manufacturingof the dispersion body; and using the solid particles to manufacture thedispersion body.
 11. A manufacturing method for a ceramic sintered body,comprising: using a ceramic raw material as the solid particles are; andmolding and firing a dispersion body that is obtained by a manufacturingmethod for manufacturing a dispersion body by mixing a plurality oftypes of solid particles, water, and a liquid other than water, themanufacturing method comprising: selecting the solid particles and theliquid such that Hansen spheres of at least two types of the solidparticles and a Hansen sphere of at least one type of the liquidmutually overlap, and a Hansen solubility parameter distance to water ofat least one type of the solid particles of which the Hansen spheresoverlap that of the liquid is greatest among all solid particles used inmanufacturing of the dispersion body; and using the solid particles andthe liquid to manufacture the dispersion body.
 12. A manufacturingmethod for a ceramic sintered body, comprising: using a ceramic rawmaterial as the solid particles are; and molding and firing a dispersionbody that is obtained by a manufacturing method for manufacturing adispersion body by mixing a plurality of types of solid particles,water, and a liquid other than water, the manufacturing methodcomprising: selecting at least two types of solid particles from a solidparticle candidate group of which a Hansen solubility parameter distanceto water is equal to or greater than 28 MPa^(1/2); selecting the solidparticles and the liquid such that Hansen spheres of the solid particlesand a Hansen sphere of at least one type of the liquid from a liquidcandidate group mutually overlap; and using the solid particles and theliquid to manufacture the dispersion body.
 13. The manufacturing methodfor a ceramic sintered body according to claim 11, wherein: the ceramicsintered body has a honeycomb structure.
 14. The manufacturing methodfor a ceramic sintered body according to claim 12, wherein: the ceramicsintered body has a honeycomb structure.